h-feed

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Revision as of 01:36, 29 September 2021 by Tantek (talk | contribs) (stub a discovery section with latest thoughts we've discussed in IndieWeb dev chat)
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Tantek Çelik (Editor)

h-feed is a simple, open format for publishing a stream or feed of h-entry posts, like complete posts on a home page or archive pages, or summaries or other brief lists of posts. h-feed is one of several open microformat draft standards suitable for embedding data in HTML.

h-feed is the microformats2 update to hAtom, and in particular its "hfeed" root class.


Status
h-feed is a microformats.org draft specification.
h-feed is ready to use and implemented in the wild, but for backwards compatibility you should also mark h-feed up as a classic hAtom "hfeed".
Participate
Open Issues
IRC
License
Per CC0, to the extent possible under law, the editors have waived all copyright and related or neighboring rights to this work. In addition, as of 2024-11-14, the editors have made this specification available under the Open Web Foundation Agreement Version 1.0.

Properties

h-feed properties, inside an element with class h-feed. All properties are optional.

root class name: h-feed

Core Properties

The following core h-feed properties have broad consensus:

  • p-name - name of the feed
  • p-author - author of the feed, optionally embed an h-card
    Main article: h-card
  • u-url - URL of the feed
  • u-photo - representative photo / icon for the feed

children:

  • nested h-entry objects representing the items of the feed

Draft Properties

None currently.

Proposed Properties

The following properties are proposed additions based on various observed examples in the wild, but are awaiting at least one reader / real world consuming code example to become a draft property:

  • p-summary - based on non-trivial actual content usage of "atom:subtitle" on Blogger and WordPress.com featured blogs's Atom feeds.
  • p-entry - to be more consistent with the cascading of p-author or p-comment.

Proposed Additions

Discovery

Implementations may discover one or more h-feeds in several ways:

  • If the implementation has already parsed an HTML document, it can look for all elements with a class name of "h-feed" in the DOM tree.
  • If the implementation has been given a URL (e.g. from a user entering it) to do h-feed discovery, it may:
    • Parse the document per microformats2-parsing and look in the top level collection of items for those of type "h-feed"
    • OR it may also do traditional feed discovery by looking through link elements with a rel value of "alternate", and once it finds one with media type of "text/mf2+html", get its href, perform any relative-URL resolution as needed, and then parse the given URL (within a specific element matching a fragment in the URL if any) for microformats2 items, again looking for top-level items (within that fragment element subtree if any) of type "h-feed"

Details:

  • Implementations may load public h-feeds without having to pass cookies or any other user-identifying information
  • Implementations should parse h-feed documents without executing any scripts (parse as if scripting is disabled or unimplemented)
  • If an implementation needs only one h-feed, it should take the first one found in any of the above methods

Implied h-feed

In the absence of an explicit "h-feed" element, implementations may infer an h-feed of all top level microformats items in the document (as determined by microformats2-parsing the document).

E.g. if an archive page has a collection of h-entry elements at the top level, implementations may imply an h-feed container for all of them and treat the entire document as a feed.

Use Cases

  • Named feeds
    • IndieWeb Readers are consuming home page feeds marked up with h-feed and using the name of the h-feed in their user interfce.
  • Generate an Atom feed
    • This seems like a legacy use-case, not sufficient to actually justify h-feed.
  • Feed per channel of content - needs a name
    • "I will have a feed per tag (channel) so I want to name them." - Sandeep Shetty in #indiewebcamp
    • It appears there is some desire to create separate feeds for an indieweb site for separate subsets of content, and name them explicitly accordingly. This presents a need for a container object for the h-entry elements, where the container itself can have a name. This is a potential interesting use-case for an explicit 'h-feed'.

Examples in the wild

Add any examples in the wild that you find to the top of this list.

  • ...
  • http://sandeep.io/ uses h-feed with p-name and p-author properties and child h-entry posts. In particular using h-feed on the <html> element allows using p-name on the <title> element and re-using the visible window title of the HTML page as the name of the feed, neatly avoiding a DRY violation.
  • ...

See https://indieweb.org/h-feed#IndieWeb_Examples for many more examples of h-feed in the wild.

Implementations

Readers

Proxies

  • Bridgy

Converters

  • unmung - will transform an RSS or Atom feed into an h-feed containing h-entries

Backward Compatibility

Publisher Compatibility

For backward compatibility, you may wish to use classic hAtom classnames in addition to the more future-proof h-feed properties, for example: 

<div class="h-feed hfeed">
  <h1 class="p-name site-title">The Markup Blog</h1>
  <p class="p-summary site-description">Stories of elements of their attributes.</p>

  <article class="h-entry hentry">
    <a class="u-url" rel="bookmark" href="2020/06/22/balanced-divisive-complementary">
      <h2 class="p-name entry-title">A Tale Of Two Tags: Part 2</h2>
    </a>
    <address class="p-author author h-card vcard">
      <a href="https://chandra.example.com/" class="u-url url p-name fn" rel="author">Chandra</a>
    </address>
    <time class="dt-published published" datetime="2012-06-22T09:45:57-07:00">June 21, 2012</time>
    <div class="p-summary entry-summary">
      <p>From balanced harmony, to divisive misunderstandings, to complementary roles.</p>
    </div>
    <a href="/category/uncategorized/" rel="category tag" class="p-category">General</a>
  </article>

  <article class="h-entry hentry">
    <a class="u-url" rel="bookmark" href="2020/06/20/best-visible-alternative-invisible">
      <h2 class="p-name entry-title">A Tale Of Two Tags: Part 1</h2>
    </a>
    <address class="p-author author h-card vcard">
      <a href="https://chandra.example.com/" class="u-url url p-name fn" rel="author">Chandra</a>
    </address>
    <time class="dt-published published" datetime="2012-06-20T08:34:46-07:00">June 20, 2012</time>
    <div class="p-summary entry-summary">
      <p>It was the best of visible tags, it was the alternative invisible tags.</p>
    </div>
    <a href="/category/uncategorized/" rel="category tag" class="p-category">General</a>
  </article>

</div>
ℹ️ Note: Note: you may use any valid HTML5 elements. The article h1 h2 address time elements are used in the example as semantically richer suggestions, however in general div span work fine too. The time element is special though in that its datetime attribute provides a more author/user friendly way of separating a machine readable ISO8601 datetime from a human readable summary.

The class hfeed is a backward compatible root class name that indicates the presence of an hAtom feed.

Backward compatibility hAtom property class names and rel values are listed below.

Parser Compatibility

Microformats parsers SHOULD detect classic properties only if a classic root class name is found and parse them as microformats2 properties.

If an "h-feed" is found, don't look for an "hfeed" on the same element.

Compat root class name: hfeed
Properties: (parsed as p- plain text unless otherwise specified):

(this section is a stub and needs review and citations to note what real world examples would each of these backcompat parsing rules actually help parse)

  • rel=tag - parse as p-category. While not a class name nor typical microformats property, rel=tag was the defined way to tag an hfeed. Thus parsers should look for rel=tag hyperlinks inside an hfeed, and take the last path segment of their "href" value as a value for a p-category property.
  • site-title - parse as p-name [WordPress (Core? Typical themes?) has this class name by default, and without it buggy parsers may imply p-name as the whole h-feed (implied properties only apply to actual h-x roots, not backcompat).]
  • site-description - parse as p-summary [WordPress (Core? Typical themes?) has this class name by default]

If no "h-feed" nor "hfeed" element is found, however multiple top-level h-entry elements (explicit or backcompat) are found, implementations may use:

  • top level h-entry elements as items in a synthetic h-feed.
  • <title> of the page or the URL of the page as p-name
  • https://indieweb.org/authorship on the page to discover default authorship for any h-entry posts lacking explicit parsed author properties.

FAQ

How do I avoid duplicating the page title

I want to use the name (title) of my page as the name of my feed, how do I avoid duplicating the page title somewhere invisibly on the page as the feed name?

If you want re-use the <title> of your page as the name of your feed, you can do so by putting the h-feed root class name on the <html> element, and the p-name property class name on the <title> element, e.g. here's a snippet showing how those tags would look: 

<html class="h-feed">
  … 
  <title class="p-name">The Markup Blog</title>
  …

What should a subscriber do with a page with multiple feeds

What do I do when a user subscribes to a URL with multiple distinct h-feeds?

A feed reader should subscribe to the first h-feed it finds at a URL.

Related: http://indiewebcamp.com/reader

See Also

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