Merge pull request #1 from witochandra/master

merge 0.6.0

.github/workflows/dart.yml

@@ -0,0 +1,19 @@
+name: Dart CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    container:
+      image:  google/dart:latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Install dependencies
+      run: pub get
+    - name: Run tests
+      run: pub run test

CHANGELOG.md

@@ -1,10 +1,27 @@
 # Changelog
+## [0.6.0](https://pub.dartlang.org/packages/webfeed/versions/0.6.0)
+- Refactor util/xml.dart
+- Support RDF feed
+- Support Syndication namespace
+
+## [0.5.2](https://pub.dartlang.org/packages/webfeed/versions/0.5.2)
+- Lower the xml package version constraints
+
+## [0.5.1](https://pub.dartlang.org/packages/webfeed/versions/0.5.1)
+- Support iTunes namespace [#19](https://github.com/witochandra/webfeed/pull/19)
+- Parse date strings into DateTime [#22](https://github.com/witochandra/webfeed/pull/22)
+- Add created & modified into dublin core namespace [#27](https://github.com/witochandra/webfeed/pull/27)
+- Upgrade xml package [#28](https://github.com/witochandra/webfeed/issues/28) 
+- Fix linting warnings
+
 ## [0.4.2](https://pub.dartlang.org/packages/webfeed/versions/0.4.2)
 ### Fixed
 - Bad import in `rss_content.dart` & `rss_source.dart`
+
 ## [0.4.1](https://pub.dartlang.org/packages/webfeed/versions/0.4.1)
 ### Added
 - Support `author` in RssFeed
+
 ## [0.4.0](https://pub.dartlang.org/packages/webfeed/versions/0.4.0)
 ### Added
 - Support for dublin core namespace

README.md

@@ -7,17 +7,19 @@ A dart package for parsing RSS and Atom feed.
 
 ### Features
 
-- [x] RSS
+- [x] RSS (0.9, 1.0, & 2.0)
 - [x] Atom
 - [x] Namespaces
     - [x] Media RSS
     - [x] Dublin Core
+    - [x] iTunes
+    - [x] Syndication
 
 ### Installing
 
 Add this line into your `pubspec.yaml`
 ```
-webfeed: ^0.4.2
+webfeed: ^0.6.0
 ```
 
 Import the package into your dart code using:
@@ -29,8 +31,8 @@ import 'package:webfeed/webfeed.dart';
 
 To parse string into `RssFeed` object use:
 ```
-var rssFeed = new RssFeed.parse(xmlString); // for parsing RSS feed
-var atomFeed = new AtomFeed.parse(xmlString); // for parsing Atom feed
+var rssFeed = RssFeed.parse(xmlString); // for parsing RSS feed
+var atomFeed = AtomFeed.parse(xmlString); // for parsing Atom feed
 ```
 
 ### Preview

analysis_options.yaml

@@ -1,7 +1,4 @@
 analyzer:
-  language:
-    enablePreviewDart2: true
-  strong-mode: true
   errors:
     unused_import: error
     unused_local_variable: error
@@ -35,3 +32,5 @@ linter:
      - prefer_typing_uninitialized_variables
      - slash_for_doc_comments
      - type_init_formals
+     - unnecessary_new
+     - prefer_single_quotes

example/main.dart

@@ -1,24 +1,19 @@
 import 'package:http/http.dart' as http;
 import 'package:webfeed/webfeed.dart';
 
-void main() {
-  var client = new http.Client();
+void main() async {
+  var client = http.Client();
 
   // RSS feed
-  client.get("https://developer.apple.com/news/releases/rss/releases.rss").then((response) {
-    return response.body;
-  }).then((bodyString) {
-    var channel = new RssFeed.parse(bodyString);
-    print(channel);
-    return channel;
-  });
+  var response = await client
+      .get('https://developer.apple.com/news/releases/rss/releases.rss');
+  var channel = RssFeed.parse(response.body);
+  print(channel);
 
   // Atom feed
-  client.get("https://www.theverge.com/rss/index.xml").then((response) {
-    return response.body;
-  }).then((bodyString) {
-    var feed = new AtomFeed.parse(bodyString);
-    print(feed);
-    return feed;
-  });
+  response = await client.get('https://www.theverge.com/rss/index.xml');
+  var feed = AtomFeed.parse(response.body);
+  print(feed);
+
+  client.close();
 }

lib/domain/atom_category.dart

@@ -8,9 +8,9 @@ class AtomCategory {
   AtomCategory(this.term, this.scheme, this.label);
 
   factory AtomCategory.parse(XmlElement element) {
-    var term = element.getAttribute("term");
-    var scheme = element.getAttribute("scheme");
-    var label = element.getAttribute("label");
+    var term = element.getAttribute('term');
+    var scheme = element.getAttribute('scheme');
+    var label = element.getAttribute('label');
     return AtomCategory(term, scheme, label);
   }
 }

lib/domain/atom_feed.dart

@@ -3,13 +3,14 @@ import 'package:webfeed/domain/atom_generator.dart';
 import 'package:webfeed/domain/atom_item.dart';
 import 'package:webfeed/domain/atom_link.dart';
 import 'package:webfeed/domain/atom_person.dart';
-import 'package:webfeed/util/helpers.dart';
+import 'package:webfeed/util/datetime.dart';
+import 'package:webfeed/util/xml.dart';
 import 'package:xml/xml.dart';
 
 class AtomFeed {
   final String id;
   final String title;
-  final String updated;
+  final DateTime updated;
   final List<AtomItem> items;
 
   final List<AtomLink> links;
@@ -39,39 +40,42 @@ class AtomFeed {
   });
 
   factory AtomFeed.parse(String xmlString) {
-    var document = parse(xmlString);
-    XmlElement feedElement;
-    try {
-      feedElement = document.findElements("feed").first;
-    } on StateError {
-      throw new ArgumentError("feed not found");
+    var document = XmlDocument.parse(xmlString);
+    var feedElement = findFirstElement(document, 'feed');
+    if (feedElement == null) {
+      throw ArgumentError('feed not found');
     }
 
     return AtomFeed(
-      id: findElementOrNull(feedElement, "id")?.text,
-      title: findElementOrNull(feedElement, "title")?.text,
-      updated: findElementOrNull(feedElement, "updated")?.text,
-      items: feedElement.findElements("entry").map((element) {
-        return AtomItem.parse(element);
-      }).toList(),
-      links: feedElement.findElements("link").map((element) {
-        return AtomLink.parse(element);
-      }).toList(),
-      authors: feedElement.findElements("author").map((element) {
-        return AtomPerson.parse(element);
-      }).toList(),
-      contributors: feedElement.findElements("contributor").map((element) {
-        return AtomPerson.parse(element);
-      }).toList(),
-      categories: feedElement.findElements("category").map((element) {
-        return AtomCategory.parse(element);
-      }).toList(),
+      id: findFirstElement(feedElement, 'id')?.text,
+      title: findFirstElement(feedElement, 'title')?.text,
+      updated: parseDateTime(findFirstElement(feedElement, 'updated')?.text),
+      items: feedElement
+          .findElements('entry')
+          .map((e) => AtomItem.parse(e))
+          .toList(),
+      links: feedElement
+          .findElements('link')
+          .map((e) => AtomLink.parse(e))
+          .toList(),
+      authors: feedElement
+          .findElements('author')
+          .map((e) => AtomPerson.parse(e))
+          .toList(),
+      contributors: feedElement
+          .findElements('contributor')
+          .map((e) => AtomPerson.parse(e))
+          .toList(),
+      categories: feedElement
+          .findElements('category')
+          .map((e) => AtomCategory.parse(e))
+          .toList(),
       generator:
-          AtomGenerator.parse(findElementOrNull(feedElement, "generator")),
-      icon: findElementOrNull(feedElement, "icon")?.text,
-      logo: findElementOrNull(feedElement, "logo")?.text,
-      rights: findElementOrNull(feedElement, "rights")?.text,
-      subtitle: findElementOrNull(feedElement, "subtitle")?.text,
+          AtomGenerator.parse(findFirstElement(feedElement, 'generator')),
+      icon: findFirstElement(feedElement, 'icon')?.text,
+      logo: findFirstElement(feedElement, 'logo')?.text,
+      rights: findFirstElement(feedElement, 'rights')?.text,
+      subtitle: findFirstElement(feedElement, 'subtitle')?.text,
     );
   }
 }

lib/domain/atom_generator.dart

@@ -11,9 +11,9 @@ class AtomGenerator {
     if (element == null) {
       return null;
     }
-    var uri = element.getAttribute("uri");
-    var version = element.getAttribute("version");
+    var uri = element.getAttribute('uri');
+    var version = element.getAttribute('version');
     var value = element.text;
-    return new AtomGenerator(uri, version, value);
+    return AtomGenerator(uri, version, value);
   }
 }

lib/domain/atom_item.dart

@@ -3,13 +3,14 @@ import 'package:webfeed/domain/atom_link.dart';
 import 'package:webfeed/domain/atom_person.dart';
 import 'package:webfeed/domain/atom_source.dart';
 import 'package:webfeed/domain/media/media.dart';
-import 'package:webfeed/util/helpers.dart';
+import 'package:webfeed/util/datetime.dart';
+import 'package:webfeed/util/xml.dart';
 import 'package:xml/xml.dart';
 
 class AtomItem {
   final String id;
   final String title;
-  final String updated;
+  final DateTime updated;
 
   final List<AtomPerson> authors;
   final List<AtomLink> links;
@@ -40,26 +41,28 @@ class AtomItem {
 
   factory AtomItem.parse(XmlElement element) {
     return AtomItem(
-      id: findElementOrNull(element, "id")?.text,
-      title: findElementOrNull(element, "title")?.text,
-      updated: findElementOrNull(element, "updated")?.text,
-      authors: element.findElements("author").map((element) {
-        return AtomPerson.parse(element);
-      }).toList(),
-      links: element.findElements("link").map((element) {
-        return AtomLink.parse(element);
-      }).toList(),
-      categories: element.findElements("category").map((element) {
-        return AtomCategory.parse(element);
-      }).toList(),
-      contributors: element.findElements("contributor").map((element) {
-        return AtomPerson.parse(element);
-      }).toList(),
-      source: AtomSource.parse(findElementOrNull(element, "source")),
-      published: findElementOrNull(element, "published")?.text,
-      content: findElementOrNull(element, "content")?.text,
-      summary: findElementOrNull(element, "summary")?.text,
-      rights: findElementOrNull(element, "rights")?.text,
+      id: findFirstElement(element, 'id')?.text,
+      title: findFirstElement(element, 'title')?.text,
+      updated: parseDateTime(findFirstElement(element, 'updated')?.text),
+      authors: element
+          .findElements('author')
+          .map((e) => AtomPerson.parse(e))
+          .toList(),
+      links:
+          element.findElements('link').map((e) => AtomLink.parse(e)).toList(),
+      categories: element
+          .findElements('category')
+          .map((e) => AtomCategory.parse(e))
+          .toList(),
+      contributors: element
+          .findElements('contributor')
+          .map((e) => AtomPerson.parse(e))
+          .toList(),
+      source: AtomSource.parse(findFirstElement(element, 'source')),
+      published: findFirstElement(element, 'published')?.text,
+      content: findFirstElement(element, 'content')?.text,
+      summary: findFirstElement(element, 'summary')?.text,
+      rights: findFirstElement(element, 'rights')?.text,
       media: Media.parse(element),
     );
   }

lib/domain/atom_link.dart

@@ -18,14 +18,14 @@ class AtomLink {
   );
 
   factory AtomLink.parse(XmlElement element) {
-    var href = element.getAttribute("href");
-    var rel = element.getAttribute("rel");
-    var type = element.getAttribute("type");
-    var title = element.getAttribute("title");
-    var hreflang = element.getAttribute("hreflang");
+    var href = element.getAttribute('href');
+    var rel = element.getAttribute('rel');
+    var type = element.getAttribute('type');
+    var title = element.getAttribute('title');
+    var hreflang = element.getAttribute('hreflang');
     var length = 0;
-    if (element.getAttribute("length") != null) {
-      length = int.parse(element.getAttribute("length"));
+    if (element.getAttribute('length') != null) {
+      length = int.parse(element.getAttribute('length'));
     }
     return AtomLink(href, rel, type, hreflang, title, length);
   }

lib/domain/atom_person.dart

@@ -1,4 +1,4 @@
-import 'package:webfeed/util/helpers.dart';
+import 'package:webfeed/util/xml.dart';
 import 'package:xml/xml.dart';
 
 class AtomPerson {
@@ -6,12 +6,13 @@ class AtomPerson {
   final String uri;
   final String email;
 
-  AtomPerson(this.name, this.uri, this.email);
+  AtomPerson({this.name, this.uri, this.email});
 
   factory AtomPerson.parse(XmlElement element) {
-    var name = findElementOrNull(element, "name")?.text;
-    var uri = findElementOrNull(element, "uri")?.text;
-    var email = findElementOrNull(element, "email")?.text;
-    return AtomPerson(name, uri, email);
+    return AtomPerson(
+      name: findFirstElement(element, 'name')?.text,
+      uri: findFirstElement(element, 'uri')?.text,
+      email: findFirstElement(element, 'email')?.text,
+    );
   }
 }

lib/domain/atom_source.dart

@@ -1,4 +1,4 @@
-import 'package:webfeed/util/helpers.dart';
+import 'package:webfeed/util/xml.dart';
 import 'package:xml/xml.dart';
 
 class AtomSource {
@@ -6,16 +6,20 @@ class AtomSource {
   final String title;
   final String updated;
 
-  AtomSource(this.id, this.title, this.updated);
+  AtomSource({
+    this.id,
+    this.title,
+    this.updated,
+  });
 
   factory AtomSource.parse(XmlElement element) {
     if (element == null) {
       return null;
     }
-    var id = findElementOrNull(element, "id")?.text;
-    var title = findElementOrNull(element, "title")?.text;
-    var updated = findElementOrNull(element, "updated")?.text;
-
-    return AtomSource(id, title, updated);
+    return AtomSource(
+      id: findFirstElement(element, 'id')?.text,
+      title: findFirstElement(element, 'title')?.text,
+      updated: findFirstElement(element, 'updated')?.text,
+    );
   }
 }

lib/domain/dublin_core/dublin_core.dart

@@ -1,4 +1,5 @@
-import 'package:webfeed/util/helpers.dart';
+import 'package:webfeed/util/datetime.dart';
+import 'package:webfeed/util/xml.dart';
 import 'package:xml/xml.dart';
 
 class DublinCore {
@@ -8,7 +9,9 @@ class DublinCore {
   final String subject;
   final String publisher;
   final String contributor;
-  final String date;
+  final DateTime date;
+  final DateTime created;
+  final DateTime modified;
   final String type;
   final String format;
   final String identifier;
@@ -26,6 +29,8 @@ class DublinCore {
     this.publisher,
     this.contributor,
     this.date,
+    this.created,
+    this.modified,
     this.type,
     this.format,
     this.identifier,
@@ -41,21 +46,23 @@ class DublinCore {
       return null;
     }
     return DublinCore(
-      title: findElementOrNull(element, "dc:title")?.text,
-      description: findElementOrNull(element, "dc:description")?.text,
-      creator: findElementOrNull(element, "dc:creator")?.text,
-      subject: findElementOrNull(element, "dc:subject")?.text,
-      publisher: findElementOrNull(element, "dc:publisher")?.text,
-      contributor: findElementOrNull(element, "dc:contributor")?.text,
-      date: findElementOrNull(element, "dc:date")?.text,
-      type: findElementOrNull(element, "dc:type")?.text,
-      format: findElementOrNull(element, "dc:format")?.text,
-      identifier: findElementOrNull(element, "dc:identifier")?.text,
-      source: findElementOrNull(element, "dc:source")?.text,
-      language: findElementOrNull(element, "dc:language")?.text,
-      relation: findElementOrNull(element, "dc:relation")?.text,
-      coverage: findElementOrNull(element, "dc:coverage")?.text,
-      rights: findElementOrNull(element, "dc:rights")?.text,
+      title: findFirstElement(element, 'dc:title')?.text,
+      description: findFirstElement(element, 'dc:description')?.text,
+      creator: findFirstElement(element, 'dc:creator')?.text,
+      subject: findFirstElement(element, 'dc:subject')?.text,
+      publisher: findFirstElement(element, 'dc:publisher')?.text,
+      contributor: findFirstElement(element, 'dc:contributor')?.text,
+      date: parseDateTime(findFirstElement(element, 'dc:date')?.text),
+      created: parseDateTime(findFirstElement(element, 'dc:created')?.text),
+      modified: parseDateTime(findFirstElement(element, 'dc:modified')?.text),
+      type: findFirstElement(element, 'dc:type')?.text,
+      format: findFirstElement(element, 'dc:format')?.text,
+      identifier: findFirstElement(element, 'dc:identifier')?.text,
+      source: findFirstElement(element, 'dc:source')?.text,
+      language: findFirstElement(element, 'dc:language')?.text,
+      relation: findFirstElement(element, 'dc:relation')?.text,
+      coverage: findFirstElement(element, 'dc:coverage')?.text,
+      rights: findFirstElement(element, 'dc:rights')?.text,
     );
   }
 }

lib/domain/itunes/itunes.dart

@@ -0,0 +1,102 @@
+import 'package:webfeed/domain/itunes/itunes_category.dart';
+import 'package:webfeed/domain/itunes/itunes_episode_type.dart';
+import 'package:webfeed/domain/itunes/itunes_image.dart';
+import 'package:webfeed/domain/itunes/itunes_owner.dart';
+import 'package:webfeed/domain/itunes/itunes_type.dart';
+import 'package:webfeed/util/xml.dart';
+import 'package:xml/xml.dart';
+
+class Itunes {
+  final String author;
+  final String summary;
+  final bool explicit;
+  final String title;
+  final String subtitle;
+  final ItunesOwner owner;
+  final List<String> keywords;
+  final ItunesImage image;
+  final List<ItunesCategory> categories;
+  final ItunesType type;
+  final String newFeedUrl;
+  final bool block;
+  final bool complete;
+  final int episode;
+  final int season;
+  final Duration duration;
+  final ItunesEpisodeType episodeType;
+
+  Itunes({
+    this.author,
+    this.summary,
+    this.explicit,
+    this.title,
+    this.subtitle,
+    this.owner,
+    this.keywords,
+    this.image,
+    this.categories,
+    this.type,
+    this.newFeedUrl,
+    this.block,
+    this.complete,
+    this.episode,
+    this.season,
+    this.duration,
+    this.episodeType,
+  });
+
+  factory Itunes.parse(XmlElement element) {
+    if (element == null) {
+      return null;
+    }
+    var episodeStr = findFirstElement(element, 'itunes:episode')?.text;
+    var seasonStr = findFirstElement(element, 'itunes:season')?.text;
+    var durationStr = findFirstElement(element, 'itunes:duration')?.text;
+    return Itunes(
+      author: findFirstElement(element, 'itunes:author')?.text,
+      summary: findFirstElement(element, 'itunes:summary')?.text,
+      explicit: parseBoolLiteral(element, 'itunes:explicit'),
+      title: findFirstElement(element, 'itunes:title')?.text,
+      subtitle: findFirstElement(element, 'itunes:subtitle')?.text,
+      owner: ItunesOwner.parse(findFirstElement(element, 'itunes:owner')),
+      keywords: findFirstElement(element, 'itunes:keywords')
+              ?.text
+              ?.split(',')
+              ?.map((keyword) => keyword.trim())
+              ?.toList() ??
+          [],
+      image: ItunesImage.parse(findFirstElement(element, 'itunes:image')),
+      categories: findElements(element, 'itunes:category')
+          .map((e) => ItunesCategory.parse(e))
+          .toList(),
+      type: newItunesType(findFirstElement(element, 'itunes:type')),
+      newFeedUrl: findFirstElement(element, 'itunes:new-feed-url')?.text,
+      block: parseBoolLiteral(element, 'itunes:block'),
+      complete: parseBoolLiteral(element, 'itunes:complete'),
+      episode: episodeStr == null ? null : int.parse(episodeStr),
+      season: seasonStr == null ? null : int.parse(seasonStr),
+      duration: durationStr == null ? null : _parseDuration(durationStr),
+      episodeType:
+          newItunesEpisodeType(findFirstElement(element, 'itunes:episodeType')),
+    );
+  }
+
+  static Duration _parseDuration(String s) {
+    var hours = 0;
+    var minutes = 0;
+    var seconds = 0;
+    var parts = s.split(':');
+    if (parts.length > 2) {
+      hours = int.parse(parts[parts.length - 3]);
+    }
+    if (parts.length > 1) {
+      minutes = int.parse(parts[parts.length - 2]);
+    }
+    seconds = int.parse(parts[parts.length - 1]);
+    return Duration(
+      hours: hours,
+      minutes: minutes,
+      seconds: seconds,
+    );
+  }
+}

lib/domain/itunes/itunes_category.dart

@@ -0,0 +1,20 @@
+import 'package:xml/xml.dart';
+
+class ItunesCategory {
+  final String category;
+  final List<String> subCategories;
+
+  ItunesCategory({this.category, this.subCategories});
+
+  factory ItunesCategory.parse(XmlElement element) {
+    if (element == null) return null;
+    return ItunesCategory(
+      category: element.getAttribute('text')?.trim(),
+      subCategories: element
+              .findElements('itunes:category')
+              ?.map((e) => e.getAttribute('text')?.trim())
+              ?.toList() ??
+          [],
+    );
+  }
+}

lib/domain/itunes/itunes_episode_type.dart

@@ -0,0 +1,16 @@
+import 'package:xml/xml.dart';
+
+enum ItunesEpisodeType { full, trailer, bonus, unknown }
+
+ItunesEpisodeType newItunesEpisodeType(XmlElement element) {
+  switch (element?.text) {
+    case 'full':
+      return ItunesEpisodeType.full;
+    case 'trailer':
+      return ItunesEpisodeType.trailer;
+    case 'bonus':
+      return ItunesEpisodeType.bonus;
+    default:
+      return ItunesEpisodeType.unknown;
+  }
+}

lib/domain/itunes/itunes_image.dart

@@ -0,0 +1,14 @@
+import 'package:xml/xml.dart';
+
+class ItunesImage {
+  final String href;
+
+  ItunesImage({this.href});
+
+  factory ItunesImage.parse(XmlElement element) {
+    if (element == null) return null;
+    return ItunesImage(
+      href: element.getAttribute('href')?.trim(),
+    );
+  }
+}

lib/domain/itunes/itunes_owner.dart

@@ -0,0 +1,17 @@
+import 'package:webfeed/util/xml.dart';
+import 'package:xml/xml.dart';
+
+class ItunesOwner {
+  final String name;
+  final String email;
+
+  ItunesOwner({this.name, this.email});
+
+  factory ItunesOwner.parse(XmlElement element) {
+    if (element == null) return null;
+    return ItunesOwner(
+      name: findFirstElement(element, 'itunes:name')?.text?.trim(),
+      email: findFirstElement(element, 'itunes:email')?.text?.trim(),
+    );
+  }
+}

lib/domain/itunes/itunes_type.dart

@@ -0,0 +1,14 @@
+import 'package:xml/xml.dart';
+
+enum ItunesType { episodic, serial, unknown }
+
+ItunesType newItunesType(XmlElement element) {
+  switch (element?.text) {
+    case 'episodic':
+      return ItunesType.episodic;
+    case 'serial':
+      return ItunesType.serial;
+    default:
+      return ItunesType.unknown;
+  }
+}

lib/domain/media/category.dart

@@ -15,9 +15,9 @@ class Category {
     if (element == null) {
       return null;
     }
-    return new Category(
-      scheme: element.getAttribute("scheme"),
-      label: element.getAttribute("label"),
+    return Category(
+      scheme: element.getAttribute('scheme'),
+      label: element.getAttribute('label'),
       value: element.text,
     );
   }

lib/domain/media/community.dart

@@ -1,7 +1,7 @@
 import 'package:webfeed/domain/media/star_rating.dart';
 import 'package:webfeed/domain/media/statistics.dart';
 import 'package:webfeed/domain/media/tags.dart';
-import 'package:webfeed/util/helpers.dart';
+import 'package:webfeed/util/xml.dart';
 import 'package:xml/xml.dart';
 
 class Community {
@@ -19,15 +19,15 @@ class Community {
     if (element == null) {
       return null;
     }
-    return new Community(
-      starRating: new StarRating.parse(
-        findElementOrNull(element, "media:starRating"),
+    return Community(
+      starRating: StarRating.parse(
+        findFirstElement(element, 'media:starRating'),
       ),
-      statistics: new Statistics.parse(
-        findElementOrNull(element, "media:statistics"),
+      statistics: Statistics.parse(
+        findFirstElement(element, 'media:statistics'),
       ),
-      tags: new Tags.parse(
-        findElementOrNull(element, "media:tags"),
+      tags: Tags.parse(
+        findFirstElement(element, 'media:tags'),
       ),
     );
   }

lib/domain/media/content.dart

@@ -34,23 +34,23 @@ class Content {
   });
 
   factory Content.parse(XmlElement element) {
-    return new Content(
-      url: element.getAttribute("url"),
-      type: element.getAttribute("type"),
-      fileSize: int.tryParse(element.getAttribute("fileSize") ?? "0"),
-      medium: element.getAttribute("medium"),
-      isDefault: element.getAttribute("isDefault") == "true",
-      expression: element.getAttribute("expression"),
-      bitrate: int.tryParse(element.getAttribute("bitrate") ?? "0"),
-      framerate: double.tryParse(element.getAttribute("framerate") ?? "0"),
+    return Content(
+      url: element.getAttribute('url'),
+      type: element.getAttribute('type'),
+      fileSize: int.tryParse(element.getAttribute('fileSize') ?? '0'),
+      medium: element.getAttribute('medium'),
+      isDefault: element.getAttribute('isDefault') == 'true',
+      expression: element.getAttribute('expression'),
+      bitrate: int.tryParse(element.getAttribute('bitrate') ?? '0'),
+      framerate: double.tryParse(element.getAttribute('framerate') ?? '0'),
       samplingrate: double.tryParse(
-        element.getAttribute("samplingrate") ?? "0",
+        element.getAttribute('samplingrate') ?? '0',
       ),
-      channels: int.tryParse(element.getAttribute("channels") ?? "0"),
-      duration: int.tryParse(element.getAttribute("duration") ?? "0"),
-      height: int.tryParse(element.getAttribute("height") ?? "0"),
-      width: int.tryParse(element.getAttribute("width") ?? "0"),
-      lang: element.getAttribute("lang"),
+      channels: int.tryParse(element.getAttribute('channels') ?? '0'),
+      duration: int.tryParse(element.getAttribute('duration') ?? '0'),
+      height: int.tryParse(element.getAttribute('height') ?? '0'),
+      width: int.tryParse(element.getAttribute('width') ?? '0'),
+      lang: element.getAttribute('lang'),
     );
   }
 }

lib/domain/media/copyright.dart

@@ -13,8 +13,8 @@ class Copyright {
     if (element == null) {
       return null;
     }
-    return new Copyright(
-      url: element.getAttribute("url"),
+    return Copyright(
+      url: element.getAttribute('url'),
       value: element.text,
     );
   }

lib/domain/media/credit.dart

@@ -12,9 +12,9 @@ class Credit {
   });
 
   factory Credit.parse(XmlElement element) {
-    return new Credit(
-      role: element.getAttribute("role"),
-      scheme: element.getAttribute("scheme"),
+    return Credit(
+      role: element.getAttribute('role'),
+      scheme: element.getAttribute('scheme'),
       value: element.text,
     );
   }

lib/domain/media/description.dart

@@ -13,8 +13,8 @@ class Description {
     if (element == null) {
       return null;
     }
-    return new Description(
-      type: element.getAttribute("type"),
+    return Description(
+      type: element.getAttribute('type'),
       value: element.text,
     );
   }

lib/domain/media/embed.dart

@@ -18,12 +18,12 @@ class Embed {
     if (element == null) {
       return null;
     }
-    return new Embed(
-      url: element.getAttribute("url"),
-      width: int.tryParse(element.getAttribute("width") ?? "0"),
-      height: int.tryParse(element.getAttribute("height") ?? "0"),
-      params: element.findElements("media:param").map((e) {
-        return new Param.parse(e);
+    return Embed(
+      url: element.getAttribute('url'),
+      width: int.tryParse(element.getAttribute('width') ?? '0'),
+      height: int.tryParse(element.getAttribute('height') ?? '0'),
+      params: element.findElements('media:param').map((e) {
+        return Param.parse(e);
       }).toList(),
     );
   }

lib/domain/media/group.dart

@@ -2,7 +2,7 @@ import 'package:webfeed/domain/media/category.dart';
 import 'package:webfeed/domain/media/content.dart';
 import 'package:webfeed/domain/media/credit.dart';
 import 'package:webfeed/domain/media/rating.dart';
-import 'package:webfeed/util/helpers.dart';
+import 'package:webfeed/util/xml.dart';
 import 'package:xml/xml.dart';
 
 class Group {
@@ -22,18 +22,18 @@ class Group {
     if (element == null) {
       return null;
     }
-    return new Group(
-      contents: element.findElements("media:content").map((e) {
-        return new Content.parse(e);
+    return Group(
+      contents: element.findElements('media:content').map((e) {
+        return Content.parse(e);
       }).toList(),
-      credits: element.findElements("media:credit").map((e) {
-        return new Credit.parse(e);
+      credits: element.findElements('media:credit').map((e) {
+        return Credit.parse(e);
       }).toList(),
-      category: new Category.parse(
-        findElementOrNull(element, "media:category"),
+      category: Category.parse(
+        findFirstElement(element, 'media:category'),
       ),
-      rating: new Rating.parse(
-        findElementOrNull(element, "media:rating"),
+      rating: Rating.parse(
+        findFirstElement(element, 'media:rating'),
       ),
     );
   }

lib/domain/media/hash.dart

@@ -13,8 +13,8 @@ class Hash {
     if (element == null) {
       return null;
     }
-    return new Hash(
-      algo: element.getAttribute("algo"),
+    return Hash(
+      algo: element.getAttribute('algo'),
       value: element.text,
     );
   }

lib/domain/media/license.dart

@@ -15,9 +15,9 @@ class License {
     if (element == null) {
       return null;
     }
-    return new License(
-      type: element.getAttribute("type"),
-      href: element.getAttribute("href"),
+    return License(
+      type: element.getAttribute('type'),
+      href: element.getAttribute('href'),
       value: element.text,
     );
   }

lib/domain/media/media.dart

@@ -19,7 +19,7 @@ import 'package:webfeed/domain/media/status.dart';
 import 'package:webfeed/domain/media/text.dart';
 import 'package:webfeed/domain/media/thumbnail.dart';
 import 'package:webfeed/domain/media/title.dart';
-import 'package:webfeed/util/helpers.dart';
+import 'package:webfeed/util/xml.dart';
 import 'package:xml/xml.dart';
 
 class Media {
@@ -78,90 +78,90 @@ class Media {
   });
 
   factory Media.parse(XmlElement element) {
-    return new Media(
-      group: new Group.parse(
-        findElementOrNull(element, "media:group"),
+    return Media(
+      group: Group.parse(
+        findFirstElement(element, 'media:group'),
       ),
-      contents: element.findElements("media:content").map((e) {
-        return new Content.parse(e);
+      contents: element.findElements('media:content').map((e) {
+        return Content.parse(e);
       }).toList(),
-      credits: element.findElements("media:credit").map((e) {
-        return new Credit.parse(e);
+      credits: element.findElements('media:credit').map((e) {
+        return Credit.parse(e);
       }).toList(),
-      category: new Category.parse(
-        findElementOrNull(element, "media:category"),
+      category: Category.parse(
+        findFirstElement(element, 'media:category'),
       ),
-      rating: new Rating.parse(
-        findElementOrNull(element, "media:rating"),
+      rating: Rating.parse(
+        findFirstElement(element, 'media:rating'),
       ),
-      title: new Title.parse(
-        findElementOrNull(element, "media:title"),
+      title: Title.parse(
+        findFirstElement(element, 'media:title'),
       ),
-      description: new Description.parse(
-        findElementOrNull(element, "media:description"),
+      description: Description.parse(
+        findFirstElement(element, 'media:description'),
       ),
-      keywords: findElementOrNull(element, "media:keywords")?.text,
-      thumbnails: element.findElements("media:thumbnail").map((e) {
-        return new Thumbnail.parse(e);
+      keywords: findFirstElement(element, 'media:keywords')?.text,
+      thumbnails: element.findElements('media:thumbnail').map((e) {
+        return Thumbnail.parse(e);
       }).toList(),
-      hash: new Hash.parse(
-        findElementOrNull(element, "media:hash"),
+      hash: Hash.parse(
+        findFirstElement(element, 'media:hash'),
       ),
-      player: new Player.parse(
-        findElementOrNull(element, "media:player"),
+      player: Player.parse(
+        findFirstElement(element, 'media:player'),
       ),
-      copyright: new Copyright.parse(
-        findElementOrNull(element, "media:copyright"),
+      copyright: Copyright.parse(
+        findFirstElement(element, 'media:copyright'),
       ),
-      text: new Text.parse(
-        findElementOrNull(element, "media:text"),
+      text: Text.parse(
+        findFirstElement(element, 'media:text'),
       ),
-      restriction: new Restriction.parse(
-        findElementOrNull(element, "media:restriction"),
+      restriction: Restriction.parse(
+        findFirstElement(element, 'media:restriction'),
       ),
-      community: new Community.parse(
-        findElementOrNull(element, "media:community"),
+      community: Community.parse(
+        findFirstElement(element, 'media:community'),
       ),
-      comments: findElementOrNull(element, "media:comments")
-              ?.findElements("media:comment")
+      comments: findFirstElement(element, 'media:comments')
+              ?.findElements('media:comment')
               ?.map((e) {
             return e.text;
           })?.toList() ??
           [],
-      embed: new Embed.parse(
-        findElementOrNull(element, "media:embed"),
+      embed: Embed.parse(
+        findFirstElement(element, 'media:embed'),
       ),
-      responses: findElementOrNull(element, "media:responses")
-              ?.findElements("media:response")
+      responses: findFirstElement(element, 'media:responses')
+              ?.findElements('media:response')
               ?.map((e) {
             return e.text;
           })?.toList() ??
           [],
-      backLinks: findElementOrNull(element, "media:backLinks")
-              ?.findElements("media:backLink")
+      backLinks: findFirstElement(element, 'media:backLinks')
+              ?.findElements('media:backLink')
               ?.map((e) {
             return e.text;
           })?.toList() ??
           [],
-      status: new Status.parse(
-        findElementOrNull(element, "media:status"),
+      status: Status.parse(
+        findFirstElement(element, 'media:status'),
       ),
-      prices: element.findElements("media:price").map((e) {
-        return new Price.parse(e);
+      prices: element.findElements('media:price').map((e) {
+        return Price.parse(e);
       }).toList(),
-      license: new License.parse(
-        findElementOrNull(element, "media:license"),
+      license: License.parse(
+        findFirstElement(element, 'media:license'),
       ),
-      peerLink: new PeerLink.parse(
-        findElementOrNull(element, "media:peerLink"),
+      peerLink: PeerLink.parse(
+        findFirstElement(element, 'media:peerLink'),
       ),
-      rights: new Rights.parse(
-        findElementOrNull(element, "media:rights"),
+      rights: Rights.parse(
+        findFirstElement(element, 'media:rights'),
       ),
-      scenes: findElementOrNull(element, "media:scenes")
-              ?.findElements("media:scene")
+      scenes: findFirstElement(element, 'media:scenes')
+              ?.findElements('media:scene')
               ?.map((e) {
-            return new Scene.parse(e);
+            return Scene.parse(e);
           })?.toList() ??
           [],
     );

lib/domain/media/param.dart

@@ -13,8 +13,8 @@ class Param {
     if (element == null) {
       return null;
     }
-    return new Param(
-      name: element.getAttribute("name"),
+    return Param(
+      name: element.getAttribute('name'),
       value: element.text,
     );
   }

lib/domain/media/peer_link.dart

@@ -15,9 +15,9 @@ class PeerLink {
     if (element == null) {
       return null;
     }
-    return new PeerLink(
-      type: element.getAttribute("type"),
-      href: element.getAttribute("href"),
+    return PeerLink(
+      type: element.getAttribute('type'),
+      href: element.getAttribute('href'),
       value: element.text,
     );
   }

lib/domain/media/player.dart

@@ -17,10 +17,10 @@ class Player {
     if (element == null) {
       return null;
     }
-    return new Player(
-      url: element.getAttribute("url"),
-      width: int.tryParse(element.getAttribute("width") ?? "0"),
-      height: int.tryParse(element.getAttribute("height") ?? "0"),
+    return Player(
+      url: element.getAttribute('url'),
+      width: int.tryParse(element.getAttribute('width') ?? '0'),
+      height: int.tryParse(element.getAttribute('height') ?? '0'),
       value: element.text,
     );
   }

lib/domain/media/price.dart

@@ -14,11 +14,11 @@ class Price {
   });
 
   factory Price.parse(XmlElement element) {
-    return new Price(
-      price: double.tryParse(element.getAttribute("price") ?? "0"),
-      type: element.getAttribute("type"),
-      info: element.getAttribute("info"),
-      currency: element.getAttribute("currency"),
+    return Price(
+      price: double.tryParse(element.getAttribute('price') ?? '0'),
+      type: element.getAttribute('type'),
+      info: element.getAttribute('info'),
+      currency: element.getAttribute('currency'),
     );
   }
 }

lib/domain/media/rating.dart

@@ -13,8 +13,8 @@ class Rating {
     if (element == null) {
       return null;
     }
-    return new Rating(
-      scheme: element.getAttribute("scheme"),
+    return Rating(
+      scheme: element.getAttribute('scheme'),
       value: element.text,
     );
   }

lib/domain/media/restriction.dart

@@ -15,9 +15,9 @@ class Restriction {
     if (element == null) {
       return null;
     }
-    return new Restriction(
-      relationship: element.getAttribute("relationship"),
-      type: element.getAttribute("type"),
+    return Restriction(
+      relationship: element.getAttribute('relationship'),
+      type: element.getAttribute('type'),
       value: element.text,
     );
   }

lib/domain/media/rights.dart

@@ -11,8 +11,8 @@ class Rights {
     if (element == null) {
       return null;
     }
-    return new Rights(
-      status: element.getAttribute("status"),
+    return Rights(
+      status: element.getAttribute('status'),
     );
   }
 }

lib/domain/media/scene.dart

@@ -1,4 +1,4 @@
-import 'package:webfeed/util/helpers.dart';
+import 'package:webfeed/util/xml.dart';
 import 'package:xml/xml.dart';
 
 class Scene {
@@ -18,11 +18,11 @@ class Scene {
     if (element == null) {
       return null;
     }
-    return new Scene(
-      title: findElementOrNull(element, "sceneTitle")?.text,
-      description: findElementOrNull(element, "sceneDescription")?.text,
-      startTime: findElementOrNull(element, "sceneStartTime")?.text,
-      endTime: findElementOrNull(element, "sceneEndTime")?.text,
+    return Scene(
+      title: findFirstElement(element, 'sceneTitle')?.text,
+      description: findFirstElement(element, 'sceneDescription')?.text,
+      startTime: findFirstElement(element, 'sceneStartTime')?.text,
+      endTime: findFirstElement(element, 'sceneEndTime')?.text,
     );
   }
 }

lib/domain/media/star_rating.dart

@@ -14,11 +14,11 @@ class StarRating {
   });
 
   factory StarRating.parse(XmlElement element) {
-    return new StarRating(
-      average: double.tryParse(element.getAttribute("average") ?? "0"),
-      count: int.tryParse(element.getAttribute("count") ?? "0"),
-      min: int.tryParse(element.getAttribute("min") ?? "0"),
-      max: int.tryParse(element.getAttribute("max") ?? "0"),
+    return StarRating(
+      average: double.tryParse(element.getAttribute('average') ?? '0'),
+      count: int.tryParse(element.getAttribute('count') ?? '0'),
+      min: int.tryParse(element.getAttribute('min') ?? '0'),
+      max: int.tryParse(element.getAttribute('max') ?? '0'),
     );
   }
 }

lib/domain/media/statistics.dart

@@ -10,9 +10,9 @@ class Statistics {
   });
 
   factory Statistics.parse(XmlElement element) {
-    return new Statistics(
-      views: int.tryParse(element.getAttribute("views") ?? "0"),
-      favorites: int.tryParse(element.getAttribute("favorites") ?? "0"),
+    return Statistics(
+      views: int.tryParse(element.getAttribute('views') ?? '0'),
+      favorites: int.tryParse(element.getAttribute('favorites') ?? '0'),
     );
   }
 }

lib/domain/media/status.dart

@@ -13,9 +13,9 @@ class Status {
     if (element == null) {
       return null;
     }
-    return new Status(
-      state: element.getAttribute("state"),
-      reason: element.getAttribute("reason"),
+    return Status(
+      state: element.getAttribute('state'),
+      reason: element.getAttribute('reason'),
     );
   }
 }

lib/domain/media/tags.dart

@@ -13,9 +13,9 @@ class Tags {
     if (element == null) {
       return null;
     }
-    return new Tags(
+    return Tags(
       tags: element.text,
-      weight: int.tryParse(element.getAttribute("weight") ?? "1"),
+      weight: int.tryParse(element.getAttribute('weight') ?? '1'),
     );
   }
 }

lib/domain/media/text.dart

@@ -19,11 +19,11 @@ class Text {
     if (element == null) {
       return null;
     }
-    return new Text(
-      type: element.getAttribute("type"),
-      lang: element.getAttribute("lang"),
-      start: element.getAttribute("start"),
-      end: element.getAttribute("end"),
+    return Text(
+      type: element.getAttribute('type'),
+      lang: element.getAttribute('lang'),
+      start: element.getAttribute('start'),
+      end: element.getAttribute('end'),
       value: element.text,
     );
   }

lib/domain/media/thumbnail.dart

@@ -14,11 +14,11 @@ class Thumbnail {
   });
 
   factory Thumbnail.parse(XmlElement element) {
-    return new Thumbnail(
-      url: element.getAttribute("url"),
-      width: element.getAttribute("width"),
-      height: element.getAttribute("height"),
-      time: element.getAttribute("time"),
+    return Thumbnail(
+      url: element.getAttribute('url'),
+      width: element.getAttribute('width'),
+      height: element.getAttribute('height'),
+      time: element.getAttribute('time'),
     );
   }
 }

lib/domain/media/title.dart

@@ -13,8 +13,8 @@ class Title {
     if (element == null) {
       return null;
     }
-    return new Title(
-      type: element.getAttribute("type"),
+    return Title(
+      type: element.getAttribute('type'),
       value: element.text,
     );
   }

lib/domain/rss_category.dart

@@ -10,7 +10,7 @@ class RssCategory {
     if (element == null) {
       return null;
     }
-    var domain = element.getAttribute("domain");
+    var domain = element.getAttribute('domain');
     var value = element.text;
 
     return RssCategory(domain, value);

lib/domain/rss_cloud.dart

@@ -19,11 +19,11 @@ class RssCloud {
     if (node == null) {
       return null;
     }
-    var domain = node.getAttribute("domain");
-    var port = node.getAttribute("port");
-    var path = node.getAttribute("path");
-    var registerProcedure = node.getAttribute("registerProcedure");
-    var protocol = node.getAttribute("protocol");
+    var domain = node.getAttribute('domain');
+    var port = node.getAttribute('port');
+    var path = node.getAttribute('path');
+    var registerProcedure = node.getAttribute('registerProcedure');
+    var protocol = node.getAttribute('protocol');
     return RssCloud(domain, port, path, registerProcedure, protocol);
   }
 }

lib/domain/rss_content.dart

@@ -1,6 +1,6 @@
 import 'package:xml/xml.dart';
 
-final _imagesRegExp = new RegExp(
+final _imagesRegExp = RegExp(
   "<img\\s.*?src=(?:'|\")([^'\">]+)(?:'|\")",
   multiLine: true,
   caseSensitive: false,

lib/domain/rss_enclosure.dart

@@ -11,9 +11,9 @@ class RssEnclosure {
     if (element == null) {
       return null;
     }
-    var url = element.getAttribute("url");
-    var type = element.getAttribute("type");
-    var length = int.tryParse(element.getAttribute("length") ?? "0");
+    var url = element.getAttribute('url');
+    var type = element.getAttribute('type');
+    var length = int.tryParse(element.getAttribute('length') ?? '0');
     return RssEnclosure(url, type, length);
   }
 }

lib/domain/rss_feed.dart

@@ -1,15 +1,15 @@
 import 'dart:core';
 
 import 'package:webfeed/domain/dublin_core/dublin_core.dart';
+import 'package:webfeed/domain/itunes/itunes.dart';
 import 'package:webfeed/domain/rss_category.dart';
 import 'package:webfeed/domain/rss_cloud.dart';
 import 'package:webfeed/domain/rss_image.dart';
 import 'package:webfeed/domain/rss_item.dart';
-import 'package:webfeed/util/helpers.dart';
+import 'package:webfeed/domain/syndication/syndication.dart';
+import 'package:webfeed/util/xml.dart';
 import 'package:xml/xml.dart';
 
-import 'rss_itunes.dart';
-
 class RssFeed {
   final String title;
   final String author;
@@ -32,7 +32,8 @@ class RssFeed {
   final String webMaster;
   final int ttl;
   final DublinCore dc;
-  final RssItunes itunes;
+  final Itunes itunes;
+  final Syndication syndication;
 
   RssFeed({
     this.title,
@@ -56,53 +57,58 @@ class RssFeed {
     this.ttl,
     this.dc,
     this.itunes,
+    this.syndication,
   });
 
   factory RssFeed.parse(String xmlString) {
-    var document = parse(xmlString);
-    XmlElement channelElement;
-    try {
-      channelElement = document.findAllElements("channel").first;
-    } on StateError {
-      throw ArgumentError("channel not found");
+    var document = XmlDocument.parse(xmlString);
+    var rss = findFirstElement(document, 'rss');
+    var rdf = findFirstElement(document, 'rdf:RDF');
+    if (rss == null && rdf == null) {
+      throw ArgumentError('not a rss feed');
+    }
+    var channelElement = findFirstElement(rss ?? rdf, 'channel');
+    if (channelElement == null) {
+      throw ArgumentError('channel not found');
     }
-
     return RssFeed(
-      title: findElementOrNull(channelElement, "title")?.text,
-      author: findElementOrNull(channelElement, "author")?.text,
-      description: findElementOrNull(channelElement, "description")?.text,
-      link: findElementOrNull(channelElement, "link")?.text,
-      items: channelElement.findElements("item").map((element) {
-        return RssItem.parse(element);
-      }).toList(),
-      image: RssImage.parse(findElementOrNull(channelElement, "image")),
-      cloud: RssCloud.parse(findElementOrNull(channelElement, "cloud")),
-      categories: channelElement.findElements("category").map((element) {
-        return RssCategory.parse(element);
-      }).toList(),
-      skipDays: findElementOrNull(channelElement, "skipDays")
-              ?.findAllElements("day")
-              ?.map((element) {
-            return element.text;
-          })?.toList() ??
+      title: findFirstElement(channelElement, 'title')?.text,
+      author: findFirstElement(channelElement, 'author')?.text,
+      description: findFirstElement(channelElement, 'description')?.text,
+      link: findFirstElement(channelElement, 'link')?.text,
+      items: (rss != null ? channelElement : rdf)
+          .findElements('item')
+          .map((e) => RssItem.parse(e))
+          .toList(),
+      image: RssImage.parse(
+          findFirstElement(rss != null ? channelElement : rdf, 'image')),
+      cloud: RssCloud.parse(findFirstElement(channelElement, 'cloud')),
+      categories: channelElement
+          .findElements('category')
+          .map((e) => RssCategory.parse(e))
+          .toList(),
+      skipDays: findFirstElement(channelElement, 'skipDays')
+              ?.findAllElements('day')
+              ?.map((e) => e.text)
+              ?.toList() ??
           [],
-      skipHours: findElementOrNull(channelElement, "skipHours")
-              ?.findAllElements("hour")
-              ?.map((element) {
-            return int.tryParse(element.text ?? "0");
-          })?.toList() ??
+      skipHours: findFirstElement(channelElement, 'skipHours')
+              ?.findAllElements('hour')
+              ?.map((e) => int.tryParse(e.text ?? '0'))
+              ?.toList() ??
           [],
-      lastBuildDate: findElementOrNull(channelElement, "lastBuildDate")?.text,
-      language: findElementOrNull(channelElement, "language")?.text,
-      generator: findElementOrNull(channelElement, "generator")?.text,
-      copyright: findElementOrNull(channelElement, "copyright")?.text,
-      docs: findElementOrNull(channelElement, "docs")?.text,
-      managingEditor: findElementOrNull(channelElement, "managingEditor")?.text,
-      rating: findElementOrNull(channelElement, "rating")?.text,
-      webMaster: findElementOrNull(channelElement, "webMaster")?.text,
-      ttl: int.tryParse(findElementOrNull(channelElement, "ttl")?.text ?? "0"),
+      lastBuildDate: findFirstElement(channelElement, 'lastBuildDate')?.text,
+      language: findFirstElement(channelElement, 'language')?.text,
+      generator: findFirstElement(channelElement, 'generator')?.text,
+      copyright: findFirstElement(channelElement, 'copyright')?.text,
+      docs: findFirstElement(channelElement, 'docs')?.text,
+      managingEditor: findFirstElement(channelElement, 'managingEditor')?.text,
+      rating: findFirstElement(channelElement, 'rating')?.text,
+      webMaster: findFirstElement(channelElement, 'webMaster')?.text,
+      ttl: int.tryParse(findFirstElement(channelElement, 'ttl')?.text ?? '0'),
       dc: DublinCore.parse(channelElement),
-      itunes: RssItunes.parse(channelElement),
+      itunes: Itunes.parse(channelElement),
+      syndication: Syndication.parse(channelElement),
     );
   }
 }

lib/domain/rss_image.dart

@@ -1,4 +1,4 @@
-import 'package:webfeed/util/helpers.dart';
+import 'package:webfeed/util/xml.dart';
 import 'package:xml/xml.dart';
 
 class RssImage {
@@ -6,16 +6,16 @@ class RssImage {
   final String url;
   final String link;
 
-  RssImage(this.title, this.url, this.link);
+  RssImage({this.title, this.url, this.link});
 
   factory RssImage.parse(XmlElement element) {
     if (element == null) {
       return null;
     }
-    var title = findElementOrNull(element, "title")?.text;
-    var url = findElementOrNull(element, "url")?.text;
-    var link = findElementOrNull(element, "link")?.text;
-
-    return RssImage(title, url, link);
+    return RssImage(
+      title: findFirstElement(element, 'title')?.text,
+      url: findFirstElement(element, 'url')?.text,
+      link: findFirstElement(element, 'link')?.text,
+    );
   }
 }

lib/domain/rss_item.dart

@@ -1,15 +1,14 @@
-import 'package:intl/intl.dart';
 import 'package:webfeed/domain/dublin_core/dublin_core.dart';
+import 'package:webfeed/domain/itunes/itunes.dart';
 import 'package:webfeed/domain/media/media.dart';
 import 'package:webfeed/domain/rss_category.dart';
 import 'package:webfeed/domain/rss_content.dart';
 import 'package:webfeed/domain/rss_enclosure.dart';
 import 'package:webfeed/domain/rss_source.dart';
-import 'package:webfeed/util/helpers.dart';
+import 'package:webfeed/util/datetime.dart';
+import 'package:webfeed/util/xml.dart';
 import 'package:xml/xml.dart';
 
-import 'rss_item_itunes.dart';
-
 class RssItem {
   final String title;
   final String description;
@@ -25,7 +24,7 @@ class RssItem {
   final Media media;
   final RssEnclosure enclosure;
   final DublinCore dc;
-  final RssItemItunes itunes;
+  final Itunes itunes;
 
   RssItem({
     this.title,
@@ -33,7 +32,7 @@ class RssItem {
     this.link,
     this.categories,
     this.guid,
-    String pubDate,
+    this.pubDate,
     this.author,
     this.comments,
     this.source,
@@ -42,33 +41,27 @@ class RssItem {
     this.enclosure,
     this.dc,
     this.itunes,
-  })
-    : this.pubDate = _parsePubDate(pubDate);
+  });
 
   factory RssItem.parse(XmlElement element) {
     return RssItem(
-      title: findElementOrNull(element, "title")?.text,
-      description: findElementOrNull(element, "description")?.text,
-      link: findElementOrNull(element, "link")?.text,
-      categories: element.findElements("category").map((element) {
-        return RssCategory.parse(element);
-      }).toList(),
-      guid: findElementOrNull(element, "guid")?.text,
-      pubDate: findElementOrNull(element, "pubDate")?.text,
-      author: findElementOrNull(element, "author")?.text,
-      comments: findElementOrNull(element, "comments")?.text,
-      source: RssSource.parse(findElementOrNull(element, "source")),
-      content: RssContent.parse(findElementOrNull(element, "content:encoded")),
+      title: findFirstElement(element, 'title')?.text,
+      description: findFirstElement(element, 'description')?.text,
+      link: findFirstElement(element, 'link')?.text,
+      categories: element
+          .findElements('category')
+          .map((e) => RssCategory.parse(e))
+          .toList(),
+      guid: findFirstElement(element, 'guid')?.text,
+      pubDate: parseDateTime(findFirstElement(element, 'pubDate')?.text),
+      author: findFirstElement(element, 'author')?.text,
+      comments: findFirstElement(element, 'comments')?.text,
+      source: RssSource.parse(findFirstElement(element, 'source')),
+      content: RssContent.parse(findFirstElement(element, 'content:encoded')),
       media: Media.parse(element),
-      enclosure: RssEnclosure.parse(findElementOrNull(element, "enclosure")),
+      enclosure: RssEnclosure.parse(findFirstElement(element, 'enclosure')),
       dc: DublinCore.parse(element),
-      itunes: RssItemItunes.parse(element),
+      itunes: Itunes.parse(element),
     );
   }
-
-  static _parsePubDate(pubDate) {
-    if (pubDate == null) return null;
-    //Locale for pubDate is always en_US, regardless of device locale
-    return DateFormat('EEE, dd MMM yyyy HH:mm:ss Z', 'en_US').parse(pubDate);
-  }
 }

lib/domain/rss_item_itunes.dart

@@ -1,83 +0,0 @@
-import 'package:webfeed/util/helpers.dart';
-import 'package:xml/xml.dart';
-
-import 'rss_itunes_category.dart';
-import 'rss_itunes_episode_type.dart';
-import 'rss_itunes_image.dart';
-
-class RssItemItunes {
-  final String title;
-  final int episode;
-  final int season;
-  final Duration duration;
-  final RssItunesEpisodeType episodeType;
-  final String author;
-  final String summary;
-  final bool explicit;
-  final String subtitle;
-  final List<String> keywords;
-  final RssItunesImage image;
-  final RssItunesCategory category;
-  final bool block;
-
-  RssItemItunes({
-    this.title,
-    this.episode,
-    this.season,
-    this.duration,
-    this.episodeType,
-    this.author,
-    this.summary,
-    this.explicit,
-    this.subtitle,
-    this.keywords,
-    this.image,
-    this.category,
-    this.block,
-  });
-
-  factory RssItemItunes.parse(XmlElement element) {
-    if (element == null) {
-      return null;
-    }
-    var episodeStr = findElementOrNull(element, "itunes:episode")?.text?.trim();
-    var seasonStr = findElementOrNull(element, "itunes:season")?.text?.trim();
-    var durationStr = findElementOrNull(element, "itunes:duration")?.text?.trim();
-
-    return RssItemItunes(
-      title: findElementOrNull(element, "itunes:title")?.text?.trim(),
-      episode: episodeStr == null ? null : int.parse(episodeStr),
-      season: seasonStr == null ? null : int.parse(seasonStr),
-      duration: durationStr == null ? null : parseDuration(durationStr),
-      episodeType: newRssItunesEpisodeType(findElementOrNull(element, "itunes:episodeType")),
-      author: findElementOrNull(element, "itunes:author")?.text?.trim(),
-      summary: findElementOrNull(element, "itunes:summary")?.text?.trim(),
-      explicit: parseBoolLiteral(element, "itunes:explicit"),
-      subtitle: findElementOrNull(element, "itunes:subtitle")?.text?.trim(),
-      keywords: findElementOrNull(element, "itunes:keywords")?.text?.split(",")?.map((keyword) => keyword.trim())?.toList(),
-      image: RssItunesImage.parse(findElementOrNull(element, "itunes:image")),
-      category: RssItunesCategory.parse(
-          findElementOrNull(element, "itunes:category")),
-      block: parseBoolLiteral(element, "itunes:block"),
-    );
-  }
-}
-
-Duration parseDuration(String s) {
-  var hours = 0;
-  var minutes = 0;
-  var seconds = 0;
-  var parts = s.split(':');
-  if (parts.length > 2) {
-    hours = int.parse(parts[parts.length - 3]);
-  }
-  if (parts.length > 1) {
-    minutes = int.parse(parts[parts.length - 2]);
-  }
-  seconds = int.parse(parts[parts.length - 1]);
-  return Duration(
-    hours: hours,
-    minutes: minutes,
-    seconds: seconds,
-  );
-}

lib/domain/rss_itunes.dart

@@ -1,69 +0,0 @@
-import 'package:xml/xml.dart';
-
-import 'package:webfeed/util/helpers.dart';
-
-import 'rss_itunes_category.dart';
-import 'rss_itunes_image.dart';
-import 'rss_itunes_owner.dart';
-import 'rss_itunes_type.dart';
-
-class RssItunes {
-  final String author;
-  final String summary;
-  final bool explicit;
-  final String title;
-  final String subtitle;
-  final RssItunesOwner owner;
-  final List<String> keywords;
-  final RssItunesImage image;
-  final List<RssItunesCategory> categories;
-  final RssItunesType type;
-  final String newFeedUrl;
-  final bool block;
-  final bool complete;
-
-  RssItunes({
-    this.author,
-    this.summary,
-    this.explicit,
-    this.title,
-    this.subtitle,
-    this.owner,
-    this.keywords,
-    this.image,
-    this.categories,
-    this.type,
-    this.newFeedUrl,
-    this.block,
-    this.complete,
-  });
-
-  factory RssItunes.parse(XmlElement element) {
-    if (element == null) {
-      return null;
-    }
-    return RssItunes(
-      author: findElementOrNull(element, "itunes:author")?.text?.trim(),
-      summary: findElementOrNull(element, "itunes:summary")?.text?.trim(),
-      explicit: parseBoolLiteral(element, "itunes:explicit"),
-      title: findElementOrNull(element, "itunes:title")?.text?.trim(),
-      subtitle: findElementOrNull(element, "itunes:subtitle")?.text?.trim(),
-      owner: RssItunesOwner.parse(findElementOrNull(element, "itunes:owner")),
-      keywords: findElementOrNull(element, "itunes:keywords")
-          ?.text
-          ?.split(",")
-          ?.map((keyword) => keyword.trim())
-          ?.toList(),
-      image: RssItunesImage.parse(findElementOrNull(element, "itunes:image")),
-      categories: findAllDirectElementsOrNull(element, "itunes:category")
-          .map((ele) => RssItunesCategory.parse(ele))
-          .toList(),
-      type: newRssItunesType(findElementOrNull(element, "itunes:type")),
-      newFeedUrl:
-          findElementOrNull(element, "itunes:new-feed-url")?.text?.trim(),
-      block: parseBoolLiteral(element, "itunes:block"),
-      complete: parseBoolLiteral(element, "itunes:complete"),
-    );
-  }
-}
-

lib/domain/rss_itunes_category.dart

@@ -1,24 +0,0 @@
-import 'package:xml/xml.dart';
-
-class RssItunesCategory {
-  final String category;
-  final List<String> subCategories;
-
-  RssItunesCategory({this.category, this.subCategories});
-
-  factory RssItunesCategory.parse(XmlElement element) {
-    if (element == null) return null;
-
-    Iterable<XmlElement> subCategories;
-    try {
-      subCategories = element.findElements("itunes:category");
-    } on StateError {
-      subCategories = null;
-    }
-    return RssItunesCategory(
-      category: element.getAttribute("text")?.trim(),
-      subCategories:
-          subCategories?.map((ele) => ele.getAttribute("text")?.trim())?.toList(),
-    );
-  }
-}

lib/domain/rss_itunes_episode_type.dart

@@ -1,19 +0,0 @@
-import 'package:xml/xml.dart';
-
-enum RssItunesEpisodeType {full, trailer, bonus}
-
-RssItunesEpisodeType newRssItunesEpisodeType(XmlElement element) {
-  // "full" is default type
-  if (element == null) return RssItunesEpisodeType.full;
-
-  switch (element.text) {
-    case "full":
-      return RssItunesEpisodeType.full;
-    case "trailer":
-      return RssItunesEpisodeType.trailer;
-    case "bonus":
-      return RssItunesEpisodeType.bonus;
-    default:
-      return null;
-  }
-}

lib/domain/rss_itunes_image.dart

@@ -1,14 +0,0 @@
-import 'package:xml/xml.dart';
-
-class RssItunesImage {
-  final String href;
-
-  RssItunesImage({this.href});
-
-  factory RssItunesImage.parse(XmlElement element) {
-    if (element == null) return null;
-    return RssItunesImage(
-      href: element.getAttribute("href")?.trim(),
-    );
-  }
-}

lib/domain/rss_itunes_owner.dart

@@ -1,18 +0,0 @@
-import 'package:xml/xml.dart';
-
-import '../util/helpers.dart';
-
-class RssItunesOwner {
-  final String name;
-  final String email;
-
-  RssItunesOwner({this.name, this.email});
-
-  factory RssItunesOwner.parse(XmlElement element) {
-    if (element == null) return null;
-    return RssItunesOwner(
-      name: findElementOrNull(element, "itunes:name")?.text?.trim(),
-      email: findElementOrNull(element, "itunes:email")?.text?.trim(),
-    );
-  }
-}

lib/domain/rss_itunes_type.dart

@@ -1,17 +0,0 @@
-import 'package:xml/xml.dart';
-
-enum RssItunesType { episodic, serial }
-
-RssItunesType newRssItunesType(XmlElement element) {
-  // "episodic" is default type
-  if (element == null) return RssItunesType.episodic;
-
-  switch (element.text) {
-    case "episodic":
-      return RssItunesType.episodic;
-    case "serial":
-      return RssItunesType.serial;
-    default:
-      return null;
-  }
-}

lib/domain/rss_source.dart

@@ -10,7 +10,7 @@ class RssSource {
     if (element == null) {
       return null;
     }
-    var url = element.getAttribute("url");
+    var url = element.getAttribute('url');
     var value = element.text;
 
     return RssSource(url, value);

lib/domain/syndication/syndication.dart

@@ -0,0 +1,51 @@
+import 'package:webfeed/util/datetime.dart';
+import 'package:webfeed/util/xml.dart';
+import 'package:xml/xml.dart';
+
+enum SyndicationUpdatePeriod { hourly, daily, weekly, monthly, yearly }
+
+class Syndication {
+  final SyndicationUpdatePeriod updatePeriod;
+  final int updateFrequency;
+  final DateTime updateBase;
+
+  Syndication({
+    this.updatePeriod,
+    this.updateFrequency,
+    this.updateBase,
+  });
+
+  factory Syndication.parse(XmlElement element) {
+    if (element == null) {
+      return null;
+    }
+    SyndicationUpdatePeriod updatePeriod;
+    switch (findFirstElement(element, 'sy:updatePeriod')?.text) {
+      case 'hourly':
+        updatePeriod = SyndicationUpdatePeriod.hourly;
+        break;
+      case 'daily':
+        updatePeriod = SyndicationUpdatePeriod.daily;
+        break;
+      case 'weekly':
+        updatePeriod = SyndicationUpdatePeriod.weekly;
+        break;
+      case 'monthly':
+        updatePeriod = SyndicationUpdatePeriod.monthly;
+        break;
+      case 'yearly':
+        updatePeriod = SyndicationUpdatePeriod.yearly;
+        break;
+      default:
+        updatePeriod = SyndicationUpdatePeriod.daily;
+        break;
+    }
+    return Syndication(
+      updatePeriod: updatePeriod,
+      updateFrequency: int.tryParse(
+          findFirstElement(element, 'sy:updateFrequency')?.text ?? '1'),
+      updateBase:
+          parseDateTime(findFirstElement(element, 'sy:updateBase')?.text),
+    );
+  }
+}

lib/util/datetime.dart

@@ -0,0 +1,24 @@
+import 'package:intl/intl.dart';
+
+var rfc822DateFormat = DateFormat('EEE, dd MMM yyyy HH:mm:ss Z', 'en_US');
+
+DateTime parseDateTime(dateString) {
+  if (dateString == null) return null;
+  return _parseRfc822DateTime(dateString) ?? _parseIso8601DateTime(dateString);
+}
+
+DateTime _parseRfc822DateTime(dateString) {
+  try {
+    return rfc822DateFormat.parse(dateString);
+  } on FormatException {
+    return null;
+  }
+}
+
+DateTime _parseIso8601DateTime(dateString) {
+  try {
+    return DateTime.parse(dateString);
+  } on FormatException {
+    return null;
+  }
+}

lib/util/helpers.dart

@@ -1,28 +0,0 @@
-import 'dart:core';
-
-import 'package:xml/xml.dart';
-
-XmlElement findElementOrNull(XmlElement element, String name,
-    {String namespace}) {
-  try {
-    return element.findAllElements(name, namespace: namespace).first;
-  } on StateError {
-    return null;
-  }
-}
-
-List<XmlElement> findAllDirectElementsOrNull(XmlElement element, String name,
-    {String namespace}) {
-  try {
-    return element.findElements(name, namespace: namespace).toList();
-  } on StateError {
-    return null;
-  }
-}
-
-bool parseBoolLiteral(XmlElement element, String tagName) {
-  var v = findElementOrNull(element, tagName)?.text?.toLowerCase()?.trim();
-  if (v == null) return null;
-  return ["yes", "true"].contains(v);
-}
-

lib/util/xml.dart

@@ -0,0 +1,40 @@
+import 'dart:core';
+
+import 'package:xml/xml.dart';
+
+XmlElement findFirstElement(
+  XmlNode node,
+  String name, {
+  bool recursive = false,
+  String namespace,
+}) {
+  try {
+    return findElements(node, name, recursive: recursive, namespace: namespace)
+        ?.first;
+  } on StateError {
+    return null;
+  }
+}
+
+Iterable<XmlElement> findElements(
+  XmlNode node,
+  String name, {
+  bool recursive = false,
+  String namespace,
+}) {
+  try {
+    if (recursive) {
+      return node.findAllElements(name, namespace: namespace);
+    } else {
+      return node.findElements(name, namespace: namespace);
+    }
+  } on StateError {
+    return null;
+  }
+}
+
+bool parseBoolLiteral(XmlElement element, String tagName) {
+  var v = findFirstElement(element, tagName)?.text?.toLowerCase()?.trim();
+  if (v == null) return false;
+  return ['yes', 'true'].contains(v);
+}

pubspec.yaml

@@ -1,12 +1,11 @@
 name: webfeed
-version: 0.4.2
-description: webfeed is a dart package for parsing RSS and Atom feeds. Media & DublinCore namespaces are also supported.
-author: Wito Chandra <wito.c.91@gmail.com>
+version: 0.6.0
+description: webfeed is a dart package for parsing RSS and Atom feeds. Media, DublinCore, iTunes, Syndication namespaces are also supported.
 homepage: https://github.com/witochandra/webfeed
 environment:
   sdk: ">=2.0.0 <3.0.0"
 dependencies:
-  xml: "^3.0.0"
+  xml: "^4.2.0"
   intl: "^0.16.0"
 dev_dependencies:
   test: ^1.3.0

test/atom_test.dart

@@ -5,113 +5,113 @@ import 'package:test/test.dart';
 import 'package:webfeed/webfeed.dart';
 
 void main() {
-  test("parse Invalid.xml", () {
-    var xmlString = new File("test/xml/Invalid.xml").readAsStringSync();
+  test('parse Invalid.xml', () {
+    var xmlString = File('test/xml/Invalid.xml').readAsStringSync();
 
     try {
-      new AtomFeed.parse(xmlString);
-      fail("Should throw Argument Error");
+      AtomFeed.parse(xmlString);
+      fail('Should throw Argument Error');
     } on ArgumentError {}
   });
 
-  test("parse Atom.xml", () {
-    var xmlString = new File("test/xml/Atom.xml").readAsStringSync();
+  test('parse Atom.xml', () {
+    var xmlString = File('test/xml/Atom.xml').readAsStringSync();
 
-    var feed = new AtomFeed.parse(xmlString);
+    var feed = AtomFeed.parse(xmlString);
 
-    expect(feed.id, "foo-bar-id");
-    expect(feed.title, "Foo bar news");
-    expect(feed.updated, "2018-04-06T13:02:46Z");
+    expect(feed.id, 'foo-bar-id');
+    expect(feed.title, 'Foo bar news');
+    expect(feed.updated, DateTime.utc(2018, 4, 6, 13, 2, 46));
 
     expect(feed.links.length, 2);
-    expect(feed.links.first.rel, "foo");
-    expect(feed.links.first.type, "text/html");
-    expect(feed.links.first.hreflang, "en");
-    expect(feed.links.first.href, "http://foo.bar.news/");
-    expect(feed.links.first.title, "Foo bar news html");
+    expect(feed.links.first.rel, 'foo');
+    expect(feed.links.first.type, 'text/html');
+    expect(feed.links.first.hreflang, 'en');
+    expect(feed.links.first.href, 'http://foo.bar.news/');
+    expect(feed.links.first.title, 'Foo bar news html');
     expect(feed.links.first.length, 1000);
 
     expect(feed.authors.length, 2);
-    expect(feed.authors.first.name, "Alice");
-    expect(feed.authors.first.uri, "http://foo.bar.news/people/alice");
-    expect(feed.authors.first.email, "alice@foo.bar.news");
+    expect(feed.authors.first.name, 'Alice');
+    expect(feed.authors.first.uri, 'http://foo.bar.news/people/alice');
+    expect(feed.authors.first.email, 'alice@foo.bar.news');
 
     expect(feed.contributors.length, 2);
-    expect(feed.contributors.first.name, "Charlie");
-    expect(feed.contributors.first.uri, "http://foo.bar.news/people/charlie");
-    expect(feed.contributors.first.email, "charlie@foo.bar.news");
+    expect(feed.contributors.first.name, 'Charlie');
+    expect(feed.contributors.first.uri, 'http://foo.bar.news/people/charlie');
+    expect(feed.contributors.first.email, 'charlie@foo.bar.news');
 
     expect(feed.categories.length, 2);
-    expect(feed.categories.first.term, "foo category");
-    expect(feed.categories.first.scheme, "this-is-foo-scheme");
-    expect(feed.categories.first.label, "this is foo label");
+    expect(feed.categories.first.term, 'foo category');
+    expect(feed.categories.first.scheme, 'this-is-foo-scheme');
+    expect(feed.categories.first.label, 'this is foo label');
 
-    expect(feed.generator.uri, "http://foo.bar.news/generator");
-    expect(feed.generator.version, "1.0");
-    expect(feed.generator.value, "Foo bar generator");
+    expect(feed.generator.uri, 'http://foo.bar.news/generator');
+    expect(feed.generator.version, '1.0');
+    expect(feed.generator.value, 'Foo bar generator');
 
-    expect(feed.icon, "http://foo.bar.news/icon.png");
-    expect(feed.logo, "http://foo.bar.news/logo.png");
-    expect(feed.subtitle, "This is subtitle");
+    expect(feed.icon, 'http://foo.bar.news/icon.png');
+    expect(feed.logo, 'http://foo.bar.news/logo.png');
+    expect(feed.subtitle, 'This is subtitle');
 
     expect(feed.items.length, 2);
     var item = feed.items.first;
-    expect(item.id, "foo-bar-entry-id-1");
-    expect(item.title, "Foo bar item 1");
-    expect(item.updated, "2018-04-06T13:02:47Z");
+    expect(item.id, 'foo-bar-entry-id-1');
+    expect(item.title, 'Foo bar item 1');
+    expect(item.updated, DateTime.utc(2018, 4, 6, 13, 2, 40));
 
     expect(item.authors.length, 2);
-    expect(item.authors.first.name, "Ellie");
-    expect(item.authors.first.uri, "http://foo.bar.news/people/ellie");
-    expect(item.authors.first.email, "ellie@foo.bar.news");
+    expect(item.authors.first.name, 'Ellie');
+    expect(item.authors.first.uri, 'http://foo.bar.news/people/ellie');
+    expect(item.authors.first.email, 'ellie@foo.bar.news');
 
     expect(item.links.length, 2);
-    expect(item.links.first.rel, "foo entry");
-    expect(item.links.first.type, "text/html");
-    expect(item.links.first.hreflang, "en");
-    expect(item.links.first.href, "http://foo.bar.news/entry");
-    expect(item.links.first.title, "Foo bar news html");
+    expect(item.links.first.rel, 'foo entry');
+    expect(item.links.first.type, 'text/html');
+    expect(item.links.first.hreflang, 'en');
+    expect(item.links.first.href, 'http://foo.bar.news/entry');
+    expect(item.links.first.title, 'Foo bar news html');
     expect(item.links.first.length, 1000);
 
     expect(item.categories.length, 2);
-    expect(item.categories.first.term, "foo entry category");
-    expect(item.categories.first.scheme, "this-is-foo-entry-scheme");
-    expect(item.categories.first.label, "this is foo entry label");
+    expect(item.categories.first.term, 'foo entry category');
+    expect(item.categories.first.scheme, 'this-is-foo-entry-scheme');
+    expect(item.categories.first.label, 'this is foo entry label');
 
     expect(item.contributors.length, 2);
-    expect(item.contributors.first.name, "Gin");
-    expect(item.contributors.first.uri, "http://foo.bar.news/people/gin");
-    expect(item.contributors.first.email, "gin@foo.bar.news");
-
-    expect(item.published, "2018-04-06T13:02:49Z");
-    expect(item.summary, "This is summary 1");
-    expect(item.content, "This is content 1");
-    expect(item.rights, "This is rights 1");
+    expect(item.contributors.first.name, 'Gin');
+    expect(item.contributors.first.uri, 'http://foo.bar.news/people/gin');
+    expect(item.contributors.first.email, 'gin@foo.bar.news');
+
+    expect(item.published, '2018-04-06T13:02:49Z');
+    expect(item.summary, 'This is summary 1');
+    expect(item.content, 'This is content 1');
+    expect(item.rights, 'This is rights 1');
   });
-  test("parse Atom-Media.xml", (){
-    var xmlString = new File("test/xml/Atom-Media.xml").readAsStringSync();
+  test('parse Atom-Media.xml', () {
+    var xmlString = File('test/xml/Atom-Media.xml').readAsStringSync();
 
-    var feed = new AtomFeed.parse(xmlString);
-    expect(feed.id, "foo-bar-id");
-    expect(feed.title, "Foo bar news");
-    expect(feed.updated, "2018-04-06T13:02:46Z");
+    var feed = AtomFeed.parse(xmlString);
+    expect(feed.id, 'foo-bar-id');
+    expect(feed.title, 'Foo bar news');
+    expect(feed.updated, DateTime.utc(2018, 4, 6, 13, 2, 46));
 
     expect(feed.items.length, 1);
-    
+
     var item = feed.items.first;
     expect(item.media.group.contents.length, 5);
     expect(item.media.group.credits.length, 2);
-    expect(item.media.group.category.value, "music/artist name/album/song");
-    expect(item.media.group.rating.value, "nonadult");
+    expect(item.media.group.category.value, 'music/artist name/album/song');
+    expect(item.media.group.rating.value, 'nonadult');
 
     expect(item.media.contents.length, 2);
     var mediaContent = item.media.contents.first;
-    expect(mediaContent.url, "http://www.foo.com/video.mov");
-    expect(mediaContent.type, "video/quicktime");
+    expect(mediaContent.url, 'http://www.foo.com/video.mov');
+    expect(mediaContent.type, 'video/quicktime');
     expect(mediaContent.fileSize, 2000);
-    expect(mediaContent.medium, "video");
+    expect(mediaContent.medium, 'video');
     expect(mediaContent.isDefault, true);
-    expect(mediaContent.expression, "full");
+    expect(mediaContent.expression, 'full');
     expect(mediaContent.bitrate, 128);
     expect(mediaContent.framerate, 25);
     expect(mediaContent.samplingrate, 44.1);
@@ -119,52 +119,54 @@ void main() {
 
     expect(item.media.credits.length, 2);
     var mediaCredit = item.media.credits.first;
-    expect(mediaCredit.role, "owner1");
-    expect(mediaCredit.scheme, "urn:yvs");
-    expect(mediaCredit.value, "copyright holder of the entity");
+    expect(mediaCredit.role, 'owner1');
+    expect(mediaCredit.scheme, 'urn:yvs');
+    expect(mediaCredit.value, 'copyright holder of the entity');
 
-    expect(item.media.category.scheme, "http://search.yahoo.com/mrss/category_ schema");
-    expect(item.media.category.label, "Music");
-    expect(item.media.category.value, "music/artist/album/song");
+    expect(item.media.category.scheme,
+        'http://search.yahoo.com/mrss/category_ schema');
+    expect(item.media.category.label, 'Music');
+    expect(item.media.category.value, 'music/artist/album/song');
 
-    expect(item.media.rating.scheme, "urn:simple");
-    expect(item.media.rating.value, "adult");
+    expect(item.media.rating.scheme, 'urn:simple');
+    expect(item.media.rating.value, 'adult');
 
-    expect(item.media.title.type, "plain");
+    expect(item.media.title.type, 'plain');
     expect(item.media.title.value, "The Judy's -- The Moo Song");
 
-    expect(item.media.description.type, "plain");
-    expect(item.media.description.value, "This was some really bizarre band I listened to as a young lad.");
-    
-    expect(item.media.keywords, "kitty, cat, big dog, yarn, fluffy");
-  
+    expect(item.media.description.type, 'plain');
+    expect(item.media.description.value,
+        'This was some really bizarre band I listened to as a young lad.');
+
+    expect(item.media.keywords, 'kitty, cat, big dog, yarn, fluffy');
+
     expect(item.media.thumbnails.length, 2);
     var mediaThumbnail = item.media.thumbnails.first;
-    expect(mediaThumbnail.url, "http://www.foo.com/keyframe1.jpg");
-    expect(mediaThumbnail.width, "75");
-    expect(mediaThumbnail.height, "50");
-    expect(mediaThumbnail.time, "12:05:01.123");
+    expect(mediaThumbnail.url, 'http://www.foo.com/keyframe1.jpg');
+    expect(mediaThumbnail.width, '75');
+    expect(mediaThumbnail.height, '50');
+    expect(mediaThumbnail.time, '12:05:01.123');
 
-    expect(item.media.hash.algo, "md5");
-    expect(item.media.hash.value, "dfdec888b72151965a34b4b59031290a");
+    expect(item.media.hash.algo, 'md5');
+    expect(item.media.hash.value, 'dfdec888b72151965a34b4b59031290a');
 
-    expect(item.media.player.url, "http://www.foo.com/player?id=1111");
+    expect(item.media.player.url, 'http://www.foo.com/player?id=1111');
     expect(item.media.player.width, 400);
     expect(item.media.player.height, 200);
-    expect(item.media.player.value, "");
+    expect(item.media.player.value, '');
 
-    expect(item.media.copyright.url, "http://blah.com/additional-info.html");
-    expect(item.media.copyright.value, "2005 FooBar Media");
+    expect(item.media.copyright.url, 'http://blah.com/additional-info.html');
+    expect(item.media.copyright.value, '2005 FooBar Media');
 
-    expect(item.media.text.type, "plain");
-    expect(item.media.text.lang, "en");
-    expect(item.media.text.start, "00:00:03.000");
-    expect(item.media.text.end, "00:00:10.000");
-    expect(item.media.text.value, " Oh, say, can you see");
+    expect(item.media.text.type, 'plain');
+    expect(item.media.text.lang, 'en');
+    expect(item.media.text.start, '00:00:03.000');
+    expect(item.media.text.end, '00:00:10.000');
+    expect(item.media.text.value, ' Oh, say, can you see');
 
-    expect(item.media.restriction.relationship, "allow");
-    expect(item.media.restriction.type, "country");
-    expect(item.media.restriction.value, "au us");
+    expect(item.media.restriction.relationship, 'allow');
+    expect(item.media.restriction.type, 'country');
+    expect(item.media.restriction.value, 'au us');
 
     expect(item.media.community.starRating.average, 3.5);
     expect(item.media.community.starRating.count, 20);
@@ -172,56 +174,58 @@ void main() {
     expect(item.media.community.starRating.max, 10);
     expect(item.media.community.statistics.views, 5);
     expect(item.media.community.statistics.favorites, 4);
-    expect(item.media.community.tags.tags, "news: 5, abc:3");
+    expect(item.media.community.tags.tags, 'news: 5, abc:3');
     expect(item.media.community.tags.weight, 1);
 
     expect(item.media.comments.length, 2);
-    expect(item.media.comments.first, "comment1");
-    expect(item.media.comments.last, "comment2");
+    expect(item.media.comments.first, 'comment1');
+    expect(item.media.comments.last, 'comment2');
 
-    expect(item.media.embed.url, "http://www.foo.com/player.swf");
+    expect(item.media.embed.url, 'http://www.foo.com/player.swf');
     expect(item.media.embed.width, 512);
     expect(item.media.embed.height, 323);
     expect(item.media.embed.params.length, 5);
-    expect(item.media.embed.params.first.name, "type");
-    expect(item.media.embed.params.first.value, "application/x-shockwave-flash");
+    expect(item.media.embed.params.first.name, 'type');
+    expect(
+        item.media.embed.params.first.value, 'application/x-shockwave-flash');
 
     expect(item.media.responses.length, 2);
-    expect(item.media.responses.first, "http://www.response1.com");
-    expect(item.media.responses.last, "http://www.response2.com");
+    expect(item.media.responses.first, 'http://www.response1.com');
+    expect(item.media.responses.last, 'http://www.response2.com');
 
     expect(item.media.backLinks.length, 2);
-    expect(item.media.backLinks.first, "http://www.backlink1.com");
-    expect(item.media.backLinks.last, "http://www.backlink2.com");
+    expect(item.media.backLinks.first, 'http://www.backlink1.com');
+    expect(item.media.backLinks.last, 'http://www.backlink2.com');
 
-    expect(item.media.status.state, "active");
+    expect(item.media.status.state, 'active');
     expect(item.media.status.reason, null);
 
     expect(item.media.prices.length, 2);
     expect(item.media.prices.first.price, 19.99);
-    expect(item.media.prices.first.type, "rent");
-    expect(item.media.prices.first.info, "http://www.dummy.jp/package_info.html");
-    expect(item.media.prices.first.currency, "EUR");
+    expect(item.media.prices.first.type, 'rent');
+    expect(
+        item.media.prices.first.info, 'http://www.dummy.jp/package_info.html');
+    expect(item.media.prices.first.currency, 'EUR');
 
-    expect(item.media.license.type, "text/html");
-    expect(item.media.license.href, "http://www.licensehost.com/license");
-    expect(item.media.license.value, " Sample license for a video");
+    expect(item.media.license.type, 'text/html');
+    expect(item.media.license.href, 'http://www.licensehost.com/license');
+    expect(item.media.license.value, ' Sample license for a video');
 
-    expect(item.media.peerLink.type, "application/x-bittorrent");
-    expect(item.media.peerLink.href, "http://www.foo.org/sampleFile.torrent");
-    expect(item.media.peerLink.value, "");
+    expect(item.media.peerLink.type, 'application/x-bittorrent');
+    expect(item.media.peerLink.href, 'http://www.foo.org/sampleFile.torrent');
+    expect(item.media.peerLink.value, '');
 
-    expect(item.media.rights.status, "official");
+    expect(item.media.rights.status, 'official');
 
     expect(item.media.scenes.length, 2);
-    expect(item.media.scenes.first.title, "sceneTitle1");
-    expect(item.media.scenes.first.description, "sceneDesc1");
-    expect(item.media.scenes.first.startTime, "00:15");
-    expect(item.media.scenes.first.endTime, "00:45");
+    expect(item.media.scenes.first.title, 'sceneTitle1');
+    expect(item.media.scenes.first.description, 'sceneDesc1');
+    expect(item.media.scenes.first.startTime, '00:15');
+    expect(item.media.scenes.first.endTime, '00:45');
   });
 
-  test("parse Atom-Empty.xml", () {
-    var xmlString = File("test/xml/Atom-Empty.xml").readAsStringSync();
+  test('parse Atom-Empty.xml', () {
+    var xmlString = File('test/xml/Atom-Empty.xml').readAsStringSync();
 
     var feed = AtomFeed.parse(xmlString);
 

test/rss_test.dart

@@ -2,60 +2,60 @@ import 'dart:core';
 import 'dart:io';
 
 import 'package:test/test.dart';
+import 'package:webfeed/domain/itunes/itunes_episode_type.dart';
+import 'package:webfeed/domain/itunes/itunes_type.dart';
+import 'package:webfeed/domain/syndication/syndication.dart';
 import 'package:webfeed/webfeed.dart';
 
-import 'package:webfeed/domain/rss_itunes_type.dart';
-import 'package:webfeed/domain/rss_itunes_episode_type.dart';
-
 void main() {
-  test("parse Invalid.xml", () {
-    var xmlString = new File("test/xml/Invalid.xml").readAsStringSync();
+  test('parse Invalid.xml', () {
+    var xmlString = File('test/xml/Invalid.xml').readAsStringSync();
 
     try {
-      new RssFeed.parse(xmlString);
-      fail("Should throw Argument Error");
+      RssFeed.parse(xmlString);
+      fail('Should throw Argument Error');
     } on ArgumentError {}
   });
-  test("parse RSS.xml", () {
-    var xmlString = new File("test/xml/RSS.xml").readAsStringSync();
+  test('parse RSS.xml', () {
+    var xmlString = File('test/xml/RSS.xml').readAsStringSync();
 
-    var feed = new RssFeed.parse(xmlString);
+    var feed = RssFeed.parse(xmlString);
 
-    expect(feed.title, "News - Foo bar News");
+    expect(feed.title, 'News - Foo bar News');
     expect(feed.description,
-        "Foo bar News and Updates feed provided by Foo bar, Inc.");
-    expect(feed.link, "https://foo.bar.news/");
-    expect(feed.author, "hello@world.net");
-    expect(feed.language, "en-US");
-    expect(feed.lastBuildDate, "Mon, 26 Mar 2018 14:00:00 PDT");
-    expect(feed.generator, "Custom");
-    expect(feed.copyright, "Copyright 2018, Foo bar Inc.");
-    expect(feed.docs, "https://foo.bar.news/docs");
-    expect(feed.managingEditor, "alice@foo.bar.news");
-    expect(feed.rating, "The PICS rating of the feed");
-    expect(feed.webMaster, "webmaster@foo.bar.news");
+        'Foo bar News and Updates feed provided by Foo bar, Inc.');
+    expect(feed.link, 'https://foo.bar.news/');
+    expect(feed.author, 'hello@world.net');
+    expect(feed.language, 'en-US');
+    expect(feed.lastBuildDate, 'Mon, 26 Mar 2018 14:00:00 PDT');
+    expect(feed.generator, 'Custom');
+    expect(feed.copyright, 'Copyright 2018, Foo bar Inc.');
+    expect(feed.docs, 'https://foo.bar.news/docs');
+    expect(feed.managingEditor, 'alice@foo.bar.news');
+    expect(feed.rating, 'The PICS rating of the feed');
+    expect(feed.webMaster, 'webmaster@foo.bar.news');
     expect(feed.ttl, 60);
 
-    expect(feed.image.title, "Foo bar News");
-    expect(feed.image.url, "https://foo.bar.news/logo.gif");
-    expect(feed.image.link, "https://foo.bar.news/");
+    expect(feed.image.title, 'Foo bar News');
+    expect(feed.image.url, 'https://foo.bar.news/logo.gif');
+    expect(feed.image.link, 'https://foo.bar.news/');
 
-    expect(feed.cloud.domain, "radio.foo.bar.news");
-    expect(feed.cloud.port, "80");
-    expect(feed.cloud.path, "/RPC2");
-    expect(feed.cloud.registerProcedure, "foo.bar.rssPleaseNotify");
-    expect(feed.cloud.protocol, "xml-rpc");
+    expect(feed.cloud.domain, 'radio.foo.bar.news');
+    expect(feed.cloud.port, '80');
+    expect(feed.cloud.path, '/RPC2');
+    expect(feed.cloud.registerProcedure, 'foo.bar.rssPleaseNotify');
+    expect(feed.cloud.protocol, 'xml-rpc');
 
     expect(feed.categories.length, 2);
     expect(feed.categories[0].domain, null);
-    expect(feed.categories[0].value, "Ipsum");
-    expect(feed.categories[1].domain, "news");
-    expect(feed.categories[1].value, "Lorem Ipsum");
+    expect(feed.categories[0].value, 'Ipsum');
+    expect(feed.categories[1].domain, 'news');
+    expect(feed.categories[1].value, 'Lorem Ipsum');
 
     expect(feed.skipDays.length, 3);
-    expect(feed.skipDays.contains("Monday"), true);
-    expect(feed.skipDays.contains("Tuesday"), true);
-    expect(feed.skipDays.contains("Sunday"), true);
+    expect(feed.skipDays.contains('Monday'), true);
+    expect(feed.skipDays.contains('Tuesday'), true);
+    expect(feed.skipDays.contains('Sunday'), true);
 
     expect(feed.skipHours.length, 5);
     expect(feed.skipHours.contains(0), true);
@@ -67,56 +67,58 @@ void main() {
     expect(feed.items.length, 2);
 
     expect(feed.items.first.title,
-        "The standard Lorem Ipsum passage, used since the 1500s");
+        'The standard Lorem Ipsum passage, used since the 1500s');
     expect(feed.items.first.description,
-        "Lorem ipsum dolor sit amet, consectetur adipiscing elit");
-    expect(feed.items.first.link, "https://foo.bar.news/1");
-    expect(feed.items.first.guid, "https://foo.bar.news/1?guid");
-    expect(feed.items.first.pubDate, DateTime(2018, 03, 26, 14)); //Mon, 26 Mar 2018 14:00:00 PDT
-    expect(feed.items.first.categories.first.domain, "news");
-    expect(feed.items.first.categories.first.value, "Lorem");
-    expect(feed.items.first.author, "alice@foo.bar.news");
-    expect(feed.items.first.source.url, "https://foo.bar.news/1?source");
-    expect(feed.items.first.source.value, "Foo Bar");
-    expect(feed.items.first.comments, "https://foo.bar.news/1/comments");
+        'Lorem ipsum dolor sit amet, consectetur adipiscing elit');
+    expect(feed.items.first.link, 'https://foo.bar.news/1');
+    expect(feed.items.first.guid, 'https://foo.bar.news/1?guid');
+    expect(feed.items.first.pubDate,
+        DateTime(2018, 03, 26, 14)); //Mon, 26 Mar 2018 14:00:00 PDT
+    expect(feed.items.first.categories.first.domain, 'news');
+    expect(feed.items.first.categories.first.value, 'Lorem');
+    expect(feed.items.first.author, 'alice@foo.bar.news');
+    expect(feed.items.first.source.url, 'https://foo.bar.news/1?source');
+    expect(feed.items.first.source.value, 'Foo Bar');
+    expect(feed.items.first.comments, 'https://foo.bar.news/1/comments');
     expect(feed.items.first.enclosure.url,
-        "http://www.scripting.com/mp3s/weatherReportSuite.mp3");
+        'http://www.scripting.com/mp3s/weatherReportSuite.mp3');
     expect(feed.items.first.enclosure.length, 12216320);
-    expect(feed.items.first.enclosure.type, "audio/mpeg");
+    expect(feed.items.first.enclosure.type, 'audio/mpeg');
 
     expect(feed.items.first.content.value,
-        "<img width=\"1000\" height=\"690\" src=\"https://test.com/image_link\"/> Test content<br />");
+        '<img width="1000" height="690" src="https://test.com/image_link"/> Test content<br />');
     expect(
-        feed.items.first.content.images.first, "https://test.com/image_link");
+        feed.items.first.content.images.first, 'https://test.com/image_link');
   });
-  test("parse RSS-Media.xml", () {
-    var xmlString = new File("test/xml/RSS-Media.xml").readAsStringSync();
+  test('parse RSS-Media.xml', () {
+    var xmlString = File('test/xml/RSS-Media.xml').readAsStringSync();
 
-    var feed = new RssFeed.parse(xmlString);
-    expect(feed.title, "Song Site");
+    var feed = RssFeed.parse(xmlString);
+    expect(feed.title, 'Song Site');
     expect(
-        feed.description, "Media RSS example with new fields added in v1.5.0");
+        feed.description, 'Media RSS example with new fields added in v1.5.0');
 
     expect(feed.items.length, 1);
 
     var item = feed.items.first;
     expect(item.title, null);
-    expect(item.link, "http://www.foo.com");
-    expect(item.pubDate, DateTime(2001, 08, 27, 16, 08, 56)); //Mon, 27 Aug 2001 16:08:56 PST
+    expect(item.link, 'http://www.foo.com');
+    expect(item.pubDate,
+        DateTime(2001, 08, 27, 16, 08, 56)); //Mon, 27 Aug 2001 16:08:56 PST
 
     expect(item.media.group.contents.length, 5);
     expect(item.media.group.credits.length, 2);
-    expect(item.media.group.category.value, "music/artist name/album/song");
-    expect(item.media.group.rating.value, "nonadult");
+    expect(item.media.group.category.value, 'music/artist name/album/song');
+    expect(item.media.group.rating.value, 'nonadult');
 
     expect(item.media.contents.length, 2);
     var mediaContent = item.media.contents.first;
-    expect(mediaContent.url, "http://www.foo.com/video.mov");
-    expect(mediaContent.type, "video/quicktime");
+    expect(mediaContent.url, 'http://www.foo.com/video.mov');
+    expect(mediaContent.type, 'video/quicktime');
     expect(mediaContent.fileSize, 2000);
-    expect(mediaContent.medium, "video");
+    expect(mediaContent.medium, 'video');
     expect(mediaContent.isDefault, true);
-    expect(mediaContent.expression, "full");
+    expect(mediaContent.expression, 'full');
     expect(mediaContent.bitrate, 128);
     expect(mediaContent.framerate, 25);
     expect(mediaContent.samplingrate, 44.1);
@@ -124,54 +126,54 @@ void main() {
 
     expect(item.media.credits.length, 2);
     var mediaCredit = item.media.credits.first;
-    expect(mediaCredit.role, "owner1");
-    expect(mediaCredit.scheme, "urn:yvs");
-    expect(mediaCredit.value, "copyright holder of the entity");
+    expect(mediaCredit.role, 'owner1');
+    expect(mediaCredit.scheme, 'urn:yvs');
+    expect(mediaCredit.value, 'copyright holder of the entity');
 
     expect(item.media.category.scheme,
-        "http://search.yahoo.com/mrss/category_ schema");
-    expect(item.media.category.label, "Music");
-    expect(item.media.category.value, "music/artist/album/song");
+        'http://search.yahoo.com/mrss/category_ schema');
+    expect(item.media.category.label, 'Music');
+    expect(item.media.category.value, 'music/artist/album/song');
 
-    expect(item.media.rating.scheme, "urn:simple");
-    expect(item.media.rating.value, "adult");
+    expect(item.media.rating.scheme, 'urn:simple');
+    expect(item.media.rating.value, 'adult');
 
-    expect(item.media.title.type, "plain");
+    expect(item.media.title.type, 'plain');
     expect(item.media.title.value, "The Judy's -- The Moo Song");
 
-    expect(item.media.description.type, "plain");
+    expect(item.media.description.type, 'plain');
     expect(item.media.description.value,
-        "This was some really bizarre band I listened to as a young lad.");
+        'This was some really bizarre band I listened to as a young lad.');
 
-    expect(item.media.keywords, "kitty, cat, big dog, yarn, fluffy");
+    expect(item.media.keywords, 'kitty, cat, big dog, yarn, fluffy');
 
     expect(item.media.thumbnails.length, 2);
     var mediaThumbnail = item.media.thumbnails.first;
-    expect(mediaThumbnail.url, "http://www.foo.com/keyframe1.jpg");
-    expect(mediaThumbnail.width, "75");
-    expect(mediaThumbnail.height, "50");
-    expect(mediaThumbnail.time, "12:05:01.123");
+    expect(mediaThumbnail.url, 'http://www.foo.com/keyframe1.jpg');
+    expect(mediaThumbnail.width, '75');
+    expect(mediaThumbnail.height, '50');
+    expect(mediaThumbnail.time, '12:05:01.123');
 
-    expect(item.media.hash.algo, "md5");
-    expect(item.media.hash.value, "dfdec888b72151965a34b4b59031290a");
+    expect(item.media.hash.algo, 'md5');
+    expect(item.media.hash.value, 'dfdec888b72151965a34b4b59031290a');
 
-    expect(item.media.player.url, "http://www.foo.com/player?id=1111");
+    expect(item.media.player.url, 'http://www.foo.com/player?id=1111');
     expect(item.media.player.width, 400);
     expect(item.media.player.height, 200);
-    expect(item.media.player.value, "");
+    expect(item.media.player.value, '');
 
-    expect(item.media.copyright.url, "http://blah.com/additional-info.html");
-    expect(item.media.copyright.value, "2005 FooBar Media");
+    expect(item.media.copyright.url, 'http://blah.com/additional-info.html');
+    expect(item.media.copyright.value, '2005 FooBar Media');
 
-    expect(item.media.text.type, "plain");
-    expect(item.media.text.lang, "en");
-    expect(item.media.text.start, "00:00:03.000");
-    expect(item.media.text.end, "00:00:10.000");
-    expect(item.media.text.value, " Oh, say, can you see");
+    expect(item.media.text.type, 'plain');
+    expect(item.media.text.lang, 'en');
+    expect(item.media.text.start, '00:00:03.000');
+    expect(item.media.text.end, '00:00:10.000');
+    expect(item.media.text.value, ' Oh, say, can you see');
 
-    expect(item.media.restriction.relationship, "allow");
-    expect(item.media.restriction.type, "country");
-    expect(item.media.restriction.value, "au us");
+    expect(item.media.restriction.relationship, 'allow');
+    expect(item.media.restriction.type, 'country');
+    expect(item.media.restriction.value, 'au us');
 
     expect(item.media.community.starRating.average, 3.5);
     expect(item.media.community.starRating.count, 20);
@@ -179,95 +181,99 @@ void main() {
     expect(item.media.community.starRating.max, 10);
     expect(item.media.community.statistics.views, 5);
     expect(item.media.community.statistics.favorites, 4);
-    expect(item.media.community.tags.tags, "news: 5, abc:3");
+    expect(item.media.community.tags.tags, 'news: 5, abc:3');
     expect(item.media.community.tags.weight, 1);
 
     expect(item.media.comments.length, 2);
-    expect(item.media.comments.first, "comment1");
-    expect(item.media.comments.last, "comment2");
+    expect(item.media.comments.first, 'comment1');
+    expect(item.media.comments.last, 'comment2');
 
-    expect(item.media.embed.url, "http://www.foo.com/player.swf");
+    expect(item.media.embed.url, 'http://www.foo.com/player.swf');
     expect(item.media.embed.width, 512);
     expect(item.media.embed.height, 323);
     expect(item.media.embed.params.length, 5);
-    expect(item.media.embed.params.first.name, "type");
+    expect(item.media.embed.params.first.name, 'type');
     expect(
-        item.media.embed.params.first.value, "application/x-shockwave-flash");
+        item.media.embed.params.first.value, 'application/x-shockwave-flash');
 
     expect(item.media.responses.length, 2);
-    expect(item.media.responses.first, "http://www.response1.com");
-    expect(item.media.responses.last, "http://www.response2.com");
+    expect(item.media.responses.first, 'http://www.response1.com');
+    expect(item.media.responses.last, 'http://www.response2.com');
 
     expect(item.media.backLinks.length, 2);
-    expect(item.media.backLinks.first, "http://www.backlink1.com");
-    expect(item.media.backLinks.last, "http://www.backlink2.com");
+    expect(item.media.backLinks.first, 'http://www.backlink1.com');
+    expect(item.media.backLinks.last, 'http://www.backlink2.com');
 
-    expect(item.media.status.state, "active");
+    expect(item.media.status.state, 'active');
     expect(item.media.status.reason, null);
 
     expect(item.media.prices.length, 2);
     expect(item.media.prices.first.price, 19.99);
-    expect(item.media.prices.first.type, "rent");
+    expect(item.media.prices.first.type, 'rent');
     expect(
-        item.media.prices.first.info, "http://www.dummy.jp/package_info.html");
-    expect(item.media.prices.first.currency, "EUR");
+        item.media.prices.first.info, 'http://www.dummy.jp/package_info.html');
+    expect(item.media.prices.first.currency, 'EUR');
 
-    expect(item.media.license.type, "text/html");
-    expect(item.media.license.href, "http://www.licensehost.com/license");
-    expect(item.media.license.value, " Sample license for a video");
+    expect(item.media.license.type, 'text/html');
+    expect(item.media.license.href, 'http://www.licensehost.com/license');
+    expect(item.media.license.value, ' Sample license for a video');
 
-    expect(item.media.peerLink.type, "application/x-bittorrent");
-    expect(item.media.peerLink.href, "http://www.foo.org/sampleFile.torrent");
-    expect(item.media.peerLink.value, "");
+    expect(item.media.peerLink.type, 'application/x-bittorrent');
+    expect(item.media.peerLink.href, 'http://www.foo.org/sampleFile.torrent');
+    expect(item.media.peerLink.value, '');
 
-    expect(item.media.rights.status, "official");
+    expect(item.media.rights.status, 'official');
 
     expect(item.media.scenes.length, 2);
-    expect(item.media.scenes.first.title, "sceneTitle1");
-    expect(item.media.scenes.first.description, "sceneDesc1");
-    expect(item.media.scenes.first.startTime, "00:15");
-    expect(item.media.scenes.first.endTime, "00:45");
+    expect(item.media.scenes.first.title, 'sceneTitle1');
+    expect(item.media.scenes.first.description, 'sceneDesc1');
+    expect(item.media.scenes.first.startTime, '00:15');
+    expect(item.media.scenes.first.endTime, '00:45');
   });
-  test("parse RSS-DC.xml", () {
-    var xmlString = File("test/xml/RSS-DC.xml").readAsStringSync();
+  test('parse RSS-DC.xml', () {
+    var xmlString = File('test/xml/RSS-DC.xml').readAsStringSync();
 
     var feed = RssFeed.parse(xmlString);
 
-    expect(feed.dc.title, "title");
-    expect(feed.dc.creator, "creator");
-    expect(feed.dc.subject, "subject");
-    expect(feed.dc.description, "description");
-    expect(feed.dc.publisher, "publisher");
-    expect(feed.dc.contributor, "contributor");
-    expect(feed.dc.date, "2000-01-01T12:00+00:00");
-    expect(feed.dc.type, "type");
-    expect(feed.dc.format, "format");
-    expect(feed.dc.identifier, "identifier");
-    expect(feed.dc.source, "source");
-    expect(feed.dc.language, "language");
-    expect(feed.dc.relation, "relation");
-    expect(feed.dc.coverage, "coverage");
-    expect(feed.dc.rights, "rights");
-
-    expect(feed.items.first.dc.title, "title");
-    expect(feed.items.first.dc.creator, "creator");
-    expect(feed.items.first.dc.subject, "subject");
-    expect(feed.items.first.dc.description, "description");
-    expect(feed.items.first.dc.publisher, "publisher");
-    expect(feed.items.first.dc.contributor, "contributor");
-    expect(feed.items.first.dc.date, "2000-01-01T12:00+00:00");
-    expect(feed.items.first.dc.type, "type");
-    expect(feed.items.first.dc.format, "format");
-    expect(feed.items.first.dc.identifier, "identifier");
-    expect(feed.items.first.dc.source, "source");
-    expect(feed.items.first.dc.language, "language");
-    expect(feed.items.first.dc.relation, "relation");
-    expect(feed.items.first.dc.coverage, "coverage");
-    expect(feed.items.first.dc.rights, "rights");
+    expect(feed.dc.title, 'title');
+    expect(feed.dc.creator, 'creator');
+    expect(feed.dc.subject, 'subject');
+    expect(feed.dc.description, 'description');
+    expect(feed.dc.publisher, 'publisher');
+    expect(feed.dc.contributor, 'contributor');
+    expect(feed.dc.date, DateTime.utc(2000, 1, 1, 12));
+    expect(feed.dc.created, DateTime.utc(2000, 1, 1, 13));
+    expect(feed.dc.modified, DateTime.utc(2000, 1, 1, 14));
+    expect(feed.dc.type, 'type');
+    expect(feed.dc.format, 'format');
+    expect(feed.dc.identifier, 'identifier');
+    expect(feed.dc.source, 'source');
+    expect(feed.dc.language, 'language');
+    expect(feed.dc.relation, 'relation');
+    expect(feed.dc.coverage, 'coverage');
+    expect(feed.dc.rights, 'rights');
+
+    expect(feed.items.first.dc.title, 'title');
+    expect(feed.items.first.dc.creator, 'creator');
+    expect(feed.items.first.dc.subject, 'subject');
+    expect(feed.items.first.dc.description, 'description');
+    expect(feed.items.first.dc.publisher, 'publisher');
+    expect(feed.items.first.dc.contributor, 'contributor');
+    expect(feed.items.first.dc.date, DateTime.utc(2000, 1, 2, 12));
+    expect(feed.items.first.dc.created, DateTime.utc(2000, 1, 2, 13));
+    expect(feed.items.first.dc.modified, DateTime.utc(2000, 1, 2, 14));
+    expect(feed.items.first.dc.type, 'type');
+    expect(feed.items.first.dc.format, 'format');
+    expect(feed.items.first.dc.identifier, 'identifier');
+    expect(feed.items.first.dc.source, 'source');
+    expect(feed.items.first.dc.language, 'language');
+    expect(feed.items.first.dc.relation, 'relation');
+    expect(feed.items.first.dc.coverage, 'coverage');
+    expect(feed.items.first.dc.rights, 'rights');
   });
 
-  test("parse RSS-Empty.xml", () {
-    var xmlString = File("test/xml/RSS-Empty.xml").readAsStringSync();
+  test('parse RSS-Empty.xml', () {
+    var xmlString = File('test/xml/RSS-Empty.xml').readAsStringSync();
 
     var feed = RssFeed.parse(xmlString);
 
@@ -310,58 +316,96 @@ void main() {
     expect(feed.items.first.content, null);
   });
 
-  test("parse RSS-Itunes.xml", () {
-    var xmlString = File("test/xml/RSS-Itunes.xml").readAsStringSync();
+  test('parse RSS-Itunes.xml', () {
+    var xmlString = File('test/xml/RSS-Itunes.xml').readAsStringSync();
 
     var feed = RssFeed.parse(xmlString);
 
-    expect(feed.itunes.author, "Changelog Media");
-    expect(feed.itunes.summary, "Foo");
+    expect(feed.itunes.author, 'Changelog Media');
+    expect(feed.itunes.summary, 'Foo');
     expect(feed.itunes.explicit, false);
     expect(feed.itunes.image.href,
-        "https://cdn.changelog.com/uploads/covers/go-time-original.png?v=63725770357");
+        'https://cdn.changelog.com/uploads/covers/go-time-original.png?v=63725770357');
     expect(feed.itunes.keywords,
-        "go,golang,open source,software,development".split(","));
-    expect(feed.itunes.owner.name, "Changelog Media");
-    expect(feed.itunes.owner.email, "editors@changelog.com");
+        'go,golang,open source,software,development'.split(','));
+    expect(feed.itunes.owner.name, 'Changelog Media');
+    expect(feed.itunes.owner.email, 'editors@changelog.com');
     expect(
         Set.from([
           feed.itunes.categories[0].category,
           feed.itunes.categories[1].category
         ]),
-        ["Technology", "Foo"]);
+        ['Technology', 'Foo']);
     for (var category in feed.itunes.categories) {
       switch (category.category) {
-        case "Foo":
-          expect(category.subCategories, ["Bar", "Baz"]);
+        case 'Foo':
+          expect(category.subCategories, ['Bar', 'Baz']);
           break;
-        case "Technology":
-          expect(category.subCategories, ["Software How-To", "Tech News"]);
+        case 'Technology':
+          expect(category.subCategories, ['Software How-To', 'Tech News']);
           break;
       }
     }
-    expect(feed.itunes.title, "Go Time");
-    expect(feed.itunes.type, RssItunesType.serial);
-    expect(feed.itunes.newFeedUrl, "wubawuba");
+    expect(feed.itunes.title, 'Go Time');
+    expect(feed.itunes.type, ItunesType.serial);
+    expect(feed.itunes.newFeedUrl, 'wubawuba');
     expect(feed.itunes.block, true);
     expect(feed.itunes.complete, true);
 
     var item = feed.items[0];
-    expect(item.itunes.episodeType, RssItunesEpisodeType.full);
+    expect(item.itunes.episodeType, ItunesEpisodeType.full);
     expect(item.itunes.episode, 1);
     expect(item.itunes.season, 1);
     expect(item.itunes.image.href,
-        "https://cdn.changelog.com/uploads/covers/go-time-original.png?v=63725770357");
+        'https://cdn.changelog.com/uploads/covers/go-time-original.png?v=63725770357');
     expect(item.itunes.duration, Duration(minutes: 32, seconds: 30));
     expect(item.itunes.explicit, false);
     expect(item.itunes.keywords,
-        "go,golang,open source,software,development".split(","));
-    expect(item.itunes.subtitle, "with Erik, Carlisia, and Brian");
-    expect(item.itunes.summary, "Foo");
+        'go,golang,open source,software,development'.split(','));
+    expect(item.itunes.subtitle, 'with Erik, Carlisia, and Brian');
+    expect(item.itunes.summary, 'Foo');
     expect(item.itunes.author,
-        "Erik St. Martin, Carlisia Pinto, and Brian Ketelsen");
+        'Erik St. Martin, Carlisia Pinto, and Brian Ketelsen');
     expect(item.itunes.explicit, false);
-    expect(item.itunes.title, "awesome title");
+    expect(item.itunes.title, 'awesome title');
     expect(item.itunes.block, false);
   });
+
+  test('parse RSS-RDF.xml', () {
+    var xmlString = File('test/xml/RSS-RDF.xml').readAsStringSync();
+
+    var feed = RssFeed.parse(xmlString);
+
+    expect(feed.title, 'Mozilla Dot Org');
+    expect(feed.link, 'http://www.mozilla.org');
+    expect(feed.description, 'the Mozilla Organization web site');
+    expect(feed.image.title, 'Mozilla');
+    expect(feed.image.url, 'http://www.mozilla.org/images/moz.gif');
+    expect(feed.image.link, 'http://www.mozilla.org');
+    expect(feed.items.length, 5);
+    expect(feed.items.first.title, 'New Status Updates');
+    expect(feed.items.first.link, 'http://www.mozilla.org/status/');
+  });
+
+  test('parse RSS-Syndication.xml', () {
+    var xmlString = File('test/xml/RSS-Syndication.xml').readAsStringSync();
+
+    var feed = RssFeed.parse(xmlString);
+
+    expect(feed.title, 'Meerkat');
+    expect(feed.link, 'http://meerkat.oreillynet.com');
+    expect(feed.description, 'Meerkat: An Open Wire Service');
+    expect(feed.image.title, 'Meerkat Powered!');
+    expect(feed.image.url,
+        'http://meerkat.oreillynet.com/icons/meerkat-powered.jpg');
+    expect(feed.image.link, 'http://meerkat.oreillynet.com');
+    expect(feed.syndication.updatePeriod, SyndicationUpdatePeriod.hourly);
+    expect(feed.syndication.updateFrequency, 2);
+    expect(feed.syndication.updateBase, DateTime.utc(2001, 1, 1, 12, 1));
+    expect(feed.items.length, 1);
+    expect(feed.items.first.title, 'XML: A Disruptive Technology');
+    expect(feed.items.first.description,
+        'XML is placing increasingly heavy loads on the existing technical infrastructure of the Internet.');
+    expect(feed.items.first.link, 'http://c.moreover.com/click/here.pl?r123');
+  });
 }

test/xml/Atom.xml

@@ -35,7 +35,7 @@
     <entry>
         <id>foo-bar-entry-id-1</id>
         <title>Foo bar item 1</title>
-        <updated>2018-04-06T13:02:47Z</updated>
+        <updated>2018-04-06T13:02:40Z</updated>
         <author>
             <name>Ellie</name>
             <uri>http://foo.bar.news/people/ellie</uri>

test/xml/RSS-DC.xml

@@ -9,6 +9,8 @@
         <dc:publisher>publisher</dc:publisher>
         <dc:contributor>contributor</dc:contributor>
         <dc:date>2000-01-01T12:00+00:00</dc:date>
+        <dc:created>2000-01-01T13:00+00:00</dc:created>
+        <dc:modified>2000-01-01T14:00+00:00</dc:modified>
         <dc:type>type</dc:type>
         <dc:format>format</dc:format>
         <dc:identifier>identifier</dc:identifier>
@@ -24,7 +26,9 @@
             <dc:description>description</dc:description>
             <dc:publisher>publisher</dc:publisher>
             <dc:contributor>contributor</dc:contributor>
-            <dc:date>2000-01-01T12:00+00:00</dc:date>
+            <dc:date>2000-01-02T12:00+00:00</dc:date>
+            <dc:created>2000-01-02T13:00+00:00</dc:created>
+            <dc:modified>2000-01-02T14:00+00:00</dc:modified>
             <dc:type>type</dc:type>
             <dc:format>format</dc:format>
             <dc:identifier>identifier</dc:identifier>

test/xml/RSS-Itunes.xml

@@ -45,12 +45,9 @@
             <itunes:keywords>go, golang, open source, software, development</itunes:keywords>
             <itunes:subtitle>with Erik, Carlisia, and Brian</itunes:subtitle>
             <itunes:summary>Foo</itunes:summary>
-            <dc:creator>
-                Erik St. Martin, Carlisia Pinto, and Brian Ketelsen
+            <dc:creator>Erik St. Martin, Carlisia Pinto, and Brian Ketelsen
             </dc:creator>
-            <itunes:author>
-                Erik St. Martin, Carlisia Pinto, and Brian Ketelsen
-            </itunes:author>
+            <itunes:author>Erik St. Martin, Carlisia Pinto, and Brian Ketelsen</itunes:author>
         </item>
     </channel>
 </rss>

test/xml/RSS-RDF.xml

@@ -0,0 +1,35 @@
+<?xml version="1.0"?>
+<rdf:RDF
+        xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+        xmlns="http://channel.netscape.com/rdf/simple/0.9/">
+    <channel>
+        <title>Mozilla Dot Org</title>
+        <link>http://www.mozilla.org</link>
+        <description>the Mozilla Organization web site</description>
+    </channel>
+    <image>
+        <title>Mozilla</title>
+        <url>http://www.mozilla.org/images/moz.gif</url>
+        <link>http://www.mozilla.org</link>
+    </image>
+    <item>
+        <title>New Status Updates</title>
+        <link>http://www.mozilla.org/status/</link>
+    </item>
+    <item>
+        <title>Bugzilla Reorganized</title>
+        <link>http://www.mozilla.org/bugs/</link>
+    </item>
+    <item>
+        <title>Mozilla Party, 2.0!</title>
+        <link>http://www.mozilla.org/party/1999/</link>
+    </item>
+    <item>
+        <title>Unix Platform Parity</title>
+        <link>http://www.mozilla.org/build/unix.html</link>
+    </item>
+    <item>
+        <title>NPL 1.0M published</title>
+        <link>http://www.mozilla.org/NPL/NPL-1.0M.html</link>
+    </item>
+</rdf:RDF>

test/xml/RSS-Syndication.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+         xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
+         xmlns="http://purl.org/rss/1.0/">
+    <channel rdf:about="http://meerkat.oreillynet.com/?_fl=rss1.0">
+        <title>Meerkat</title>
+        <link>http://meerkat.oreillynet.com</link>
+        <description>Meerkat: An Open Wire Service</description>
+        <sy:updatePeriod>hourly</sy:updatePeriod>
+        <sy:updateFrequency>2</sy:updateFrequency>
+        <sy:updateBase>2001-01-01T12:01+00:00</sy:updateBase>
+        <image rdf:resource="http://meerkat.oreillynet.com/icons/meerkat-powered.jpg"/>
+    </channel>
+    <image rdf:about="http://meerkat.oreillynet.com/icons/meerkat-powered.jpg">
+        <title>Meerkat Powered!</title>
+        <url>http://meerkat.oreillynet.com/icons/meerkat-powered.jpg</url>
+        <link>http://meerkat.oreillynet.com</link>
+    </image>
+    <item rdf:about="http://c.moreover.com/click/here.pl?r123">
+        <title>XML: A Disruptive Technology</title>
+        <link>http://c.moreover.com/click/here.pl?r123</link>
+        <description>XML is placing increasingly heavy loads on the existing technical infrastructure of the Internet.</description>
+    </item>
+</rdf:RDF>