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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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* The Initial Developer of the Original Code is Robert Sayre.
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*
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#include "nsISupports.idl"

interface nsIURI;
interface nsIPropertyBag2;
interface nsIArray;

/**
* A shared base for feeds and items, which are pretty similar,
* but they have some divergent attributes and require
* different convenience methods.
*/ 
[scriptable, uuid(5622f340-7dd1-4ddf-b171-3dc815f96abf)]
interface nsIFeedContainer : nsISupports 
{
  /**
  * Many feeds contain an ID distinct from their URI, and
  * entries have standard fields for this in all major formats.
  */
  attribute AString identifier;

  /**
  * The fields found in the document. Common Atom
  * and RSS fields are normalized. This includes some namespaced
  * extensions such as dc:subject and content:encoded. 
  * Consumers can avoid normalization by checking the feed type
  * and accessing specific fields.
  *
  * Common namespaces are accessed using prefixes, like get("dc:subject");.
  * See nsIFeedResult::registerExtensionPrefix.
  */
  attribute nsIPropertyBag2 fields;

  /**
  * Sometimes there's no title, or the title contains markup.
  *
  * @returns A plain text title string gleaned from whatever 
  *          the publisher has included in the feed. In most
  *          cases, this is the contents of the <title>.
  */
  attribute AString title;

  /**
  * Returns the primary link for the feed or entry.
  */
  attribute nsIURI link;

  /**
  * Returns all links for a feed or entry.
  */
  attribute nsIArray links;

  /**
  * Returns the categories found in a feed or entry.
  */
  attribute nsIArray categories;

  /**
  * Syncs a container's fields with its convience attributes.
  */
  void normalize();
};
