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= hAtom =
{{DISPLAYTITLE:hAtom 0.1}}
 
{{latest|h-entry}}
hAtom is a microformat for content that can be syndicated, primarily but not exclusively weblog postings. hAtom is a strongly based on a subset of the [http://www.atomenabled.org/ Atom] syndication format; every concept in hAtom has a corresponding definition in Atom.  
{{Template:DraftSpecification}}
 
NOTE: the structure is in the process of being constructed, please give me a few days to get it in shape! [[DavidJanes]]


hAtom is a microformat for content that can be syndicated, primarily but not exclusively weblog postings. hAtom is based on a subset of the [http://www.atomenabled.org/ Atom] syndication format. hAtom will be one of several [[microformats]] open standards.
__TOC__
__TOC__
== Draft Specification ==
== Draft Specification ==


=== Editor ===
<div class="vcard">
* [http://blogmatrix.blogmatrix.com/ David Janes], [http://www.blogmatrix.com BlogMatrix, Inc.]
;<span class="role">Editor/Author</span>
:<span class="fn">[http://blogmatrix.blogmatrix.com/ David Janes]</span> <span class="org">([http://www.blogmatrix.com BlogMatrix, Inc.])</span>
</div>


=== Authors ===
;Contributors
* [http://blogmatrix.blogmatrix.com/ David Janes], [http://www.blogmatrix.com BlogMatrix, Inc]
:<span class="vcard"><span class="fn">[http://members.optusnet.com.au/benjamincarlyle/benjamin/blog/ Benjamin Carlyle]</span></span>
:<span class="vcard"><span class="fn">[[User:Tantek|Tantek Çelik]]</span> (<span class="url">http://tantek.com/</span> and before at [http://technorati.com Technorati, Inc.])</span>


=== Copyright ===
[[hatom#Copyright|copyright]] and [[hatom#Patents|patents]] statements apply.
{{MicroFormatCopyrightStatement2005}}


=== Patents ===
== Status ==
{{MicroFormatPatentStatement}}
hAtom 0.1 is a microformats.org draft specification. Public discussion on hAtom takes place on [[hatom-feedback]], the #microformats [[irc]] channel on irc.freenode.net, and [http://microformats.org/discuss/mail/microformats-discuss/ microformats-discuss mailing list].


== Introduction ==
=== Available languages ===
The English version of this specification is the only normative version. For translations of this document see the [[#translations]] section.


== Semantic XHTML Design Principles ==
=== Errata and Updates ===
{{semantic-xhtml-design-principles}}
Known errors and issues in this specification are corrected in [[hatom-issues-resolved|resolved]] and [[hatom-issues-closed|closed]] issues. Please check there before reporting [[hatom-issues|issues]].


== Format ==
The hAtom 0.2 update is currently under development and incorporates known errata corrections as well as the [[value-class-pattern]].
=== In General ===


=== Schema ===
== Introduction ==
Schema elements are based on the Atom nomenclature and follow the microformat pattern of prefixing a unique identifier (in this case, <code>atom</code>) on the outermost container elements -- the Feed or Entry. The parts of this microformat are based on analysis of many weblog, bulletin board and media posts and can be read [[blog-post-brainstorming#Discovered_Elements]]. Note the renaming of 'EntryGroup' to 'Feed' to be more consistent with Atom ternminology.
hAtom is a [[microformat]] for identifying semantic information in weblog posts and practically any other place [http://www.atomenabled.org/ Atom] may be used, such as news articles. hAtom content is easily added to most blogs by simple modifications to the blog's template definitions.
 
==== Nomenclature ====


{| width="100%" border="1" cellspacing="0"
{{rfc-2119-intro}}
|-
! width="150" | Concept
! Atom Identifier
! hAtom Microformat Usage
|-
| Feed
| <code>atom:feed</code>
| add <code>class="feed"</code>; OR implicit in the XHTML page
|-
| Feed Title
| <code>atom:title</code>
| ''Not defined in the first iteration of this proposal.''
|-
| Feed Permalink
| <code>atom:link@rel=alternate</code>
| ''Not defined in the first iteration of this proposal.''
|-
| Entry
| <code>atom:entry</code>
| Add <code>class="entry"</code>; if practical, also define <code>id="unique-identifier"</code> to the Entry.
|-
| Entry Title
| <code>atom:title</code>
| Use <code>&lt;h#></code> in block elements; OR non-preferentially add <code>class="title"</code> in inline elements.
|-
| Entry Content
| <code>atom:content</code>
| Add <code>class="content"</code> to all appropriate blocks. Multiple Entry Content blocks are logically considered one concatenated <code>atom:content</code> equivalent.
|-
| Entry Summary
| <code>atom:summary</code>
| Add <code>class="summary"</code> to all appropriate blocks. Multiple Entry Summary blocks are logically considered one concatenated <code>atom:summary</code> equivalent.
|-
| Entry Permalink
| <code>atom:link</code>
| Add <code>rel="link"</code>.
|-
| Entry Created
| <code>atom:published</code>
| Use <code>&lt;abbr class="published" title="YYYYMMYYThh:mm:ss"></code>...<code>&lt;/abbr></code>, following the [[datetime-design-pattern]].
|-
| Entry Author
| <code>atom:author</code>
| Use <code>&lt;address class="vcard"></code>...<code>&lt;/address></code>
|}


==== Nesting Rules ====
== Example ==
Here is a simple blog post example:


==== Disambigutation ====
<syntaxhighlight lang="html">
 
<article class="hentry">
=== XMDP Profile ===
  <h1 class="entry-title">Microformats are amazing</h1>
 
  <p>Published by <span class="author vcard"><span class="fn">W. Developer</span></span>
=== Parsing Details ===
     on <time class="published" datetime="2013-06-13 12:00:00">13<sup>th</sup> June 2013</time></p>
 
 
== Examples ==
  <p class="entry-summary">In which I extoll the virtues of using microformats.</p>
 
 
This section is informative.
  <div class="entry-content">
 
     <p>Blah blah blah</p>
=== Transformation 1 ===
 
A well behaved weblog.
 
Original:
 
<pre><nowiki>
<body>
<div id="wrap">
  <div id="content">
  ...
  <div class="entry">
    <h3 id="post-60">
    <a href="http://www.microformats.org/blog/..." rel="bookmark" title="...">Wiki Attack</a>
    </h3>
    <p>We had a bit of trouble with ...</p>
    <p>We&#8217;ve restored the wiki and ...</p>
    <p>If anyone is working to combat said spammers ...</p>
 
    <h4 class="tags">Technorati Tags:</h4>
    <ul class="tags">
    <li><a href="http://technorati.com/tag/mediawiki" rel="tag">mediawiki</a></li>
     <li><a href="http://technorati.com/tag/microformats" rel="tag">microformats</a></li>
    <li><a href="http://technorati.com/tag/spam" rel="tag">spam</a></li>
    </ul>
 
    <ul class="post-info">
    <li>
      <a href="http://www.microformats.org/blog/..." rel="bookmark" title="...">October 10th, 2005</a>
    </li>
    <li>
      <address class="vcard"><a class="url fn" href="http://theryanking.com">Ryan King</a></address>
    </li>
    <li>
      <a href="http://www.microformats.org/blog/...">4 Comments</a>
    </li>
     </ul>
  </div>
 
  <div class="entry">
  ....
  </div>
  ...
   </div>
   </div>
</div>
</article>
</body>
</syntaxhighlight>
</nowiki></pre>


Transformed to hAtom compliant (shown in UPPER CASE for visibility only):
=== Get started ===
The class '''<code>hentry</code>''' is a ''root class name'' that indicates the presence of an hAtom entry.


<pre><nowiki>
'''<code>entry-title</code>''', '''<code>author</code>''', '''<code>published</code>''', '''<code>entry-summary</code>''', '''<code>entry-content</code>''' and the other hAtom property classnames listed below define properties of the entry.
<body>
<div id="wrap">
  <div id="feed content">
  ...
  <div class="entry entry" ID="post-60">
    <h3>
    <a href="http://www.microformats.org/blog/..." rel="LINK bookmark" title="...">Wiki Attack</a>
    </h3>
    <DIV CLASS="CONTENT">
    <p>We had a bit of trouble with ...</p>
    <p>We&#8217;ve restored the wiki and ...</p>
    <p>If anyone is working to combat said spammers ...</p>
    </DIV>


    <h4 class="tags">Technorati Tags:</h4>
== Format ==
    <ul class="tags">
=== In General ===
    <li><a href="http://technorati.com/tag/mediawiki" rel="tag">mediawiki</a></li>
The [http://atomenabled.org/developers/syndication/#person Atom Syndication Format] provides the conceptual basis for this microformat, with the following caveats:
    <li><a href="http://technorati.com/tag/microformats" rel="tag">microformats</a></li>
    <li><a href="http://technorati.com/tag/spam" rel="tag">spam</a></li>
    </ul>


    <ul class="post-info">
* Atom provides a lot more functionality than we need for a "blog post" microformat, so we've taken the minimal number of elements needed.
    <li>
* the "logical" model of hAtom is that of Atom. If there is a conflict, Atom should be taken as correct.
      <a href="http://www.microformats.org/blog/..." rel="LINK bookmark"
* the "physical" model of hAtom -- the actual writing of elements -- is a lot more varied than Atom provides for, due to the variety of ways weblogs are actually produced in the wild. The hAtom microformat provides a number of rules for "bridging the gap"
        title="..."><ABBR CLASS="POSTED" TITLE="20051010T14:07:00-0700">October 10th, 2005</ABBR></a>
    </li>
    <li>
      <address class="vcard"><a class="url fn" href="http://theryanking.com">Ryan King</a></address>
    </li>
    <li>
      <a href="http://www.microformats.org/blog/...">4 Comments</a>
    </li>
    </ul>
  </div>
 
  <div class="entry entry" ID="post-59">
  ....
  </div>
  ...
  </div>
</div>
</body>
</nowiki></pre>


Changes:
=== Schema ===
* Added <code>class="feed"</code> to Feed
Schema elements are based on the Atom nomenclature and follow the microformat pattern of prefixing a unique identifier (in this case, '<code>h</code>') on the outermost container elements -- the Feed or Entry. The parts of this microformat are based on analysis of many weblog, bulletin board and media posts and can be read [[blog-post-brainstorming#Discovered_Elements]].
* Added <code>class="entry"</code> to each Entry
* Moved <code>id="###"</code> from <code>&lt;h3></code> to Entry
* Added <code>rel="link"</code> to all Entry Permalinks
* Added <code>&lt;div class="content"></code>...<code>&lt;/div></code> around the Entry Content
* Added <code>&lt;abbr class="posted" title="YYYYMMDDThh:mm:ss+ZZZZ"></code>...<code>&lt;/abbr></code> around the Entry Datetime


Also note:
The hAtom schema consists of the following:
* We did not need to add a <code>&lt;address></code> element
* We did not need to add a <code>&lt;h#></code> element


=== Transformation 2 ===
* hfeed ('''<code>hfeed</code>'''). optional.
** '''<code>feed category</code>'''. optional. keywords or phrases, using '''[[rel-tag]]'''.
** [[hentry]] ('''<code>hentry</code>''').
*** '''<code>entry-title</code>'''. required. text.
*** '''<code>entry-content</code>'''. optional (see field description). text. [*]
*** '''<code>entry-summary</code>'''. optional. text.
*** '''<code>updated</code>'''. required using [[value-class-pattern#Date_and_time_parsing|value class pattern date and time]]. [*]
*** '''<code>published</code>'''. optional using [[value-class-pattern#Date_and_time_parsing|value class pattern date and time]].
*** '''<code>author</code>'''. required using '''[[hcard|hCard]]'''. [*]
*** '''<code>bookmark</code>''' (permalink). optional, using '''[[rel-bookmark]]'''.
*** tags. optional. keywords or phrases, using '''[[rel-tag]]'''.


A not-so well behaved weblog (an older blogspot weblog)
[*] Some required elements have defaults if missing, see below.


Original:
=== Field and Element Details ===


<pre><nowiki>
===== Feed =====
<body bgcolor="...">
* a Feed element is identified by the class name <code>hfeed</code>
* a Feed element represents the concept of an [http://www.atomenabled.org/developers/syndication/atom-format-spec.php#rfc.section.4.1.1 Atom feed]
* the Feed element is optional and, if missing, is assumed to be the page
* hAtom documents {{may}} have multiple Feed elements


<div class="posts">
===== Feed Category =====
  <a name="112993192128302715">&nbsp;</a><br>
* a Feed Category element is identified by [[rel-tag]]
  <div style="clear:both;"></div><strong>Nelson's final prayer</strong>
* a Feed {{may}} have a Feed Category
  written on the night before Trafalgar:<blockquote>May the Great God, ... heart.
* a Feed Category element represents the concept of an [http://www.atomenabled.org/developers/syndication/atom-format-spec.php#rfc.section.4.2.2 Atom category] inside a [http://www.atomenabled.org/developers/syndication/#optionalFeedElements feed]
  <div style="clear:both; padding-bottom: 0.25em;"></div>
* Feed Category elements {{must}} appear inside a Feed element but not inside an Entry element
  <br>
* the [[rel-tag]] <code>href</code> encodes the atom <code>category:term</code>; the link text defines the atom <code>category:label</code>
  <span class="byline">
  posted by Natalie at
  <a href="2005_10_16_nataliesolent_archive.html#112993192128302715">9:49 PM</a>
  </span>
</div>


<div class="posts">
===== Entry =====
  <a name="112993022840118939">&nbsp;</a>
* an Entry element is identified by class name <code>hentry</code>
  <br>
* an Entry element represents the concept of an [http://www.atomenabled.org/developers/syndication/atom-format-spec.php#rfc.section.4.1.2 Atom entry]
  <div style="clear:both;"></div><strong>I really, truly </strong>didn't go ... view.
* any microformat content inside a <code>&lt;blockquote></code> or <code>&lt;q></code> element within the Entry should not be considered part of the Entry.
  <div style="clear:both; padding-bottom: 0.25em;"></div>
: ''This allows quoting other microformated data without worry of corrupting the model''
  <br>
  <span class="byline">
  posted by Natalie at
  <a href="2005_10_16_nataliesolent_archive.html#112993022840118939">9:28 PM</a>
  </span>
</div>
...


</body>
===== Entry Category =====
</nowiki></pre>
* an Entry Category element is identified by [[rel-tag]]
* an Entry {{may}} have an Entry Category
* an Entry Category element represents the concept of an [http://www.atomenabled.org/developers/syndication/atom-format-spec.php#rfc.section.4.2.2 Atom category] inside an [http://www.atomenabled.org/developers/syndication/#optionalEntryElements entry]
* the [[rel-tag]] <code>href</code> encodes the atom <code>category:term</code>; the link text defines the atom <code>category:label</code>


Transformed to hAtom compliant:
===== Entry Title =====
* an Entry Title element is identified by the class name <code>entry-title</code>
* an Entry {{should}} have an Entry Title
* an Entry Title element represents the concept of an [http://www.atomenabled.org/developers/syndication/atom-format-spec.php#rfc.section.4.2.14 Atom entry title]
* if the Entry Title is missing, use
** the first <code>&lt;h#></code> element in the Entry, or
** the <code>&lt;title></code> of the page, if there is no enclosing Feed element, or
** assume it is the empty string


<pre><nowiki>
===== Entry Content =====
<body bgcolor="...">
* an Entry Content element is identified by class name <code>entry-content</code>
* an Entry {{should}} have Entry Content
* an Entry Content element represents the concept of an [http://www.atomenabled.org/developers/syndication/atom-format-spec.php#atomContent Atom content]
* an Entry {{may}} have 0 or more Entry Content elements. The "logical Entry Content" of an Entry is the concatenation, in order of appearance, of all the Entry Contents within the Entry
: ''Many web logs split content into multiple sections with a "Read More" link and JavaScript tricks. This is also needed in cases where Entry Titles are coded in-line and are considered part of the content.''
* if the Entry Content is missing, assume it is the empty string


<DIV CLASS="feed">
===== Entry Summary =====
  <div class="entry posts" ID="112993192128302715">
* an Entry Summary element is identified by class name <code>entry-summary</code>
  <strong CLASS="TITLE CONTENT">
* an Entry Summary element represents the concept of an [http://www.atomenabled.org/developers/syndication/atom-format-spec.php#rfc.section.4.2.13 Atom summary]
    Nelson's final prayer
* an Entry {{may}} have 0 or more Entry Summary elements. The "logical Entry Summary" of an Entry is the concatenation, in order of appearance, of all the Entry Summarys within the Entry
  </strong>
  <SPAN CLASS="CONTENT">
    written on the night before Trafalgar:<blockquote>May the Great God, ... heart.
  </SPAN>
  <DIV>
    <span class="byline">posted by <address>Natalie</address> at
    <a REL="LINK" href="HTTP://NATALIESOLENT.BLOGSPOT.COM/2005_10_16_nataliesolent_archive.html#112993192128302715">
    <ABBR CLASS="POSTED" TITLE="20051024T094900-0000">9:49 PM</ABBR></a>
    </span>
  </DIV>
  </div>


  <div class="entry posts" ID="112993022840118939">
===== Entry Permalink =====
  <strong CLASS="TITLE CONTENT">I really, truly </strong>
* an Entry Permalink element is identified by [[rel-bookmark]]
  <SPAN CLASS="CONTENT">
* an Entry {{should}} have an Entry Permalink
    didn't go ... view.
* an Entry Permalink element represents the concept of an [http://www.atomenabled.org/developers/syndication/atom-format-spec.php#rfc.section.4.2.7 Atom link in an entry]
  </SPAN>
* if the Entry Permalink is missing, use the URI of the page; if the Entry has an "id" attribute, add that as a fragment to the page URI to distinguish individual entries
  <DIV>
    <span class="byline">
    posted by <address>Natalie</address> at
    <a REL="LINK" href="HTTP://NATALIESOLENT.BLOGSPOT.COM/2005_10_16_nataliesolent_archive.html#112993022840118939">
    <ABBR CLASS="POSTED" TITLE="20051024T094900-0000">9:28 PM</ABBR></a>
    </span>
  </DIV>
  </div>
...
</DIV>


</body>
===== Entry Updated =====
</nowiki></pre>
* an Entry Updated element is identified by class name <code>updated</code>
* an Entry Updated element represents the concept of [http://www.atomenabled.org/developers/syndication/atom-format-spec.php#rfc.section.4.2.15 Atom updated]
* an Entry {{should}} have an Entry Updated element
* use the [[value-class-pattern#Date_and_time_parsing|value class pattern date and time]] to encode the updated datetime
* if there is no Entry Updated element,
** use the Entry Published element, if present
** otherwise the page is invalid hAtom


Changes:
===== Entry Published =====
* Added <code>class="feed"</code> to Feed
* an Entry Published element is identified by the class name <code>published</code>
* Added <code>class="entry"</code> to each Entry
* an Entry Published element represents the concept of [http://www.atomenabled.org/developers/syndication/atom-format-spec.php#rfc.section.4.2.9 Atom published]
* Moved <code>id="###"</code> up to the Entry (and deleted the empty anchor block)
* use the [[value-class-pattern#Date_and_time_parsing|value class pattern date and time]] to encode the published datetime
* Added <code>rel="link"</code> to the Entry Permalinks
* Made the Entry Permalink non-relative
* Added <code>&lt;span class="title"></code>...<code>&lt;/div></code> around the Entry Title
* Added <code>&lt;span class="content"></code>...<code>&lt;/div></code> around the Entry Title (!)
* Added <code>&lt;span class="content"></code>...<code>&lt;/div></code> around the Entry Content
* Added <code>&lt;abbr class="posted" title="YYYYMMDDThh:mm:ss+ZZZZ"></code>...<code>&lt;/abbr></code> around the Entry Datetime
* Added <code>&lt;address></code> to the poster's name


Also note:
===== Entry Author =====
* there are multiple content blocks, because Natalie Solent embeds the title in the content
* an Entry Author element is represented by class name <code>author</code>
* cleaned up lots of crap HTML presentation stuff, with the assumption it would be fixed in the stylesheet
* an Entry Author element represents the concept of an [http://www.atomenabled.org/developers/syndication/atom-format-spec.php#rfc.section.4.2.1 Atom author]
* this is one of the uglier transformations you're likely to see
* an Entry Author element {{must}} be encoded in an [[hcard|hCard]]
* an Entry Author element {{should}} be encoded in an <code>&lt;address></code> element
* an Entry {{should}} have at least one Entry Author element
* an Entry {{may}} have more than one Entry Author elements
* if the Entry Author is missing
** find the [[algorithm-nearest-in-parent|Nearest In Parent]] <code>&lt;address></code> element(s) with class name <code>author</code> and that is/are a valid [[hcard|hCard]]
** otherwise the entry is invalid hAtom


=== Transformation 3 ===
=== XMDP Profile ===
See [[hatom-profile]].


A media page.
== Examples ==


Original:
See [[hatom-examples]].


<pre><nowiki>
=== Examples in the wild ===
</nowiki></pre>


Transformed to hAtom compliant:
See [[hatom-examples-in-wild]].


<pre><nowiki>
== Implementations ==
</nowiki></pre>


Changes:
See [[hatom-implementations]].
*


=== Transformation 4 ===
== Copyright ==
{{MicroFormatCopyrightStatement2005}}
* [[User:Tantek|Tantek]]: I release all my contributions to this specification into the public domain and I encourage the other authors to do so as well.
** When all authors/editors have done so, we can remove the MicroFormatCopyrightStatement template reference and replace it with the MicroFormatPublicDomainContributionStatement.


A bulletin board.
== Patents ==
 
{{MicroFormatPatentStatement}}
Original:


<pre><nowiki>
== Semantic HTML Design Principles ==
</nowiki></pre>
<div id="Semantic_XHTML_Design_Principles">{{semantic-html-design-principles}}</div>
 
Transformed to hAtom compliant:
 
<pre><nowiki>
</nowiki></pre>
 
Changes:
*
 
=== More Examples ===
 
See [[hatom-examples]].
 
== Examples in the wild ==
This section is '''informative'''.
 
== Implementations ==
This section is '''informative'''.


== References ==
== References ==
=== Normative References ===
=== Normative References ===
* [http://www.w3.org/TR/2002/REC-xhtml1-20020801/ XHTML 1.0 SE]
* [http://www.w3.org/TR/2002/REC-xhtml1-20020801/ XHTML 1.0 SE]
* [http://www.atomenabled.org/ Atom]
* [http://www.ietf.org/rfc/rfc4287 RFC4287: The Atom Syndication Format]
* [[hcard-parsing]]
* [[rfc-2119|RFC 2119]]
* [[iso-8601|ISO8601]]


=== Informative References ===
=== Informative References ===
* [http://www.atomenabled.org/ atomenabled.org]


==== Specifications That Use hAtom ====
== Further Reading ==
 
* [http://www.ablognotlimited.com/articles/getting-semantic-with-microformats-part-5-hatom/ Getting Semantic With Microformats, Part 5: hAtom] by [http://www.ablognotlimited.com/ Emily Lewis]
==== Similar Work ====


== Work in progress ==
== Work in progress ==
Line 353: Line 207:


* [[blog-post-brainstorming|blog-post Brainstorming]]
* [[blog-post-brainstorming|blog-post Brainstorming]]
=== Version 0.1 ===
Version 0.1 was released 28 February 2006.


== Discussions ==
== Discussions ==
Line 362: Line 220:


=== Issues ===
=== Issues ===
* Please add any issues with the specification to the separate [[htom-issues|hAtom issues]] document.
* Please add any issues with the specification to the separate [[hatom-issues|hAtom issues]] document.


==See Also==
==See Also==
* [[hatom|hAtom]] - the draft proposal
{{hatom-related-pages}}
* [[hatom-issues]] - problems? complaints? ideas? Put them here
* [[rel-enclosure]] - how to semantically reference enclosures (e.g. podcasts) in hAtom
* [[hatom-faq]] - knowledge base
* [[blog-post-brainstorming]]
* [[blog-post-brainstorming]]
* [[blog-post-formats]]
* [[blog-post-formats]]
* [[blog-post-examples]]
* [[blog-post-examples]]
* [[blog-post-feed-equivalence]]
* [[blog-description-format]] - how to describe a blog (as opposed to the individual entries, which is what we're doing here)
* [[blog-description-format]] - how to describe a blog (as opposed to the individual entries, which is what we're doing here)
* [[xhtml-syndication]]
[[Category:Draft Specifications]]
[[Category:hAtom]]
== Translations ==
Read the hAtom draft specification in additional <span id="languages">languages</span>:
* [[hatom-fr|français]]

Latest revision as of 23:32, 20 June 2024

See latest version: h-entry

This document represents a draft microformat specification. Although drafts are somewhat mature in the development process, the stability of this document cannot be guaranteed, and implementers should be prepared to keep abreast of future developments and changes. Watch this wiki page, or follow discussions on the #microformats IRC channel to stay up-to-date.

hAtom is a microformat for content that can be syndicated, primarily but not exclusively weblog postings. hAtom is based on a subset of the Atom syndication format. hAtom will be one of several microformats open standards.

Draft Specification

Editor/Author
David Janes (BlogMatrix, Inc.)
Contributors
Benjamin Carlyle
Tantek Çelik (http://tantek.com/ and before at Technorati, Inc.)

copyright and patents statements apply.

Status

hAtom 0.1 is a microformats.org draft specification. Public discussion on hAtom takes place on hatom-feedback, the #microformats irc channel on irc.freenode.net, and microformats-discuss mailing list.

Available languages

The English version of this specification is the only normative version. For translations of this document see the #translations section.

Errata and Updates

Known errors and issues in this specification are corrected in resolved and closed issues. Please check there before reporting issues.

The hAtom 0.2 update is currently under development and incorporates known errata corrections as well as the value-class-pattern.

Introduction

hAtom is a microformat for identifying semantic information in weblog posts and practically any other place Atom may be used, such as news articles. hAtom content is easily added to most blogs by simple modifications to the blog's template definitions.

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119.

Example

Here is a simple blog post example:

<article class="hentry">
  <h1 class="entry-title">Microformats are amazing</h1>
  <p>Published by <span class="author vcard"><span class="fn">W. Developer</span></span>
     on <time class="published" datetime="2013-06-13 12:00:00">13<sup>th</sup> June 2013</time></p>
  
  <p class="entry-summary">In which I extoll the virtues of using microformats.</p>
  
  <div class="entry-content">
    <p>Blah blah blah</p>
  </div>
</article>

Get started

The class hentry is a root class name that indicates the presence of an hAtom entry.

entry-title, author, published, entry-summary, entry-content and the other hAtom property classnames listed below define properties of the entry.

Format

In General

The Atom Syndication Format provides the conceptual basis for this microformat, with the following caveats:

  • Atom provides a lot more functionality than we need for a "blog post" microformat, so we've taken the minimal number of elements needed.
  • the "logical" model of hAtom is that of Atom. If there is a conflict, Atom should be taken as correct.
  • the "physical" model of hAtom -- the actual writing of elements -- is a lot more varied than Atom provides for, due to the variety of ways weblogs are actually produced in the wild. The hAtom microformat provides a number of rules for "bridging the gap"

Schema

Schema elements are based on the Atom nomenclature and follow the microformat pattern of prefixing a unique identifier (in this case, 'h') on the outermost container elements -- the Feed or Entry. The parts of this microformat are based on analysis of many weblog, bulletin board and media posts and can be read blog-post-brainstorming#Discovered_Elements.

The hAtom schema consists of the following:

[*] Some required elements have defaults if missing, see below.

Field and Element Details

Feed
  • a Feed element is identified by the class name hfeed
  • a Feed element represents the concept of an Atom feed
  • the Feed element is optional and, if missing, is assumed to be the page
  • hAtom documents MAY have multiple Feed elements
Feed Category
  • a Feed Category element is identified by rel-tag
  • a Feed MAY have a Feed Category
  • a Feed Category element represents the concept of an Atom category inside a feed
  • Feed Category elements MUST appear inside a Feed element but not inside an Entry element
  • the rel-tag href encodes the atom category:term; the link text defines the atom category:label
Entry
  • an Entry element is identified by class name hentry
  • an Entry element represents the concept of an Atom entry
  • any microformat content inside a <blockquote> or <q> element within the Entry should not be considered part of the Entry.
This allows quoting other microformated data without worry of corrupting the model
Entry Category
  • an Entry Category element is identified by rel-tag
  • an Entry MAY have an Entry Category
  • an Entry Category element represents the concept of an Atom category inside an entry
  • the rel-tag href encodes the atom category:term; the link text defines the atom category:label
Entry Title
  • an Entry Title element is identified by the class name entry-title
  • an Entry SHOULD have an Entry Title
  • an Entry Title element represents the concept of an Atom entry title
  • if the Entry Title is missing, use
    • the first <h#> element in the Entry, or
    • the <title> of the page, if there is no enclosing Feed element, or
    • assume it is the empty string
Entry Content
  • an Entry Content element is identified by class name entry-content
  • an Entry SHOULD have Entry Content
  • an Entry Content element represents the concept of an Atom content
  • an Entry MAY have 0 or more Entry Content elements. The "logical Entry Content" of an Entry is the concatenation, in order of appearance, of all the Entry Contents within the Entry
Many web logs split content into multiple sections with a "Read More" link and JavaScript tricks. This is also needed in cases where Entry Titles are coded in-line and are considered part of the content.
  • if the Entry Content is missing, assume it is the empty string
Entry Summary
  • an Entry Summary element is identified by class name entry-summary
  • an Entry Summary element represents the concept of an Atom summary
  • an Entry MAY have 0 or more Entry Summary elements. The "logical Entry Summary" of an Entry is the concatenation, in order of appearance, of all the Entry Summarys within the Entry
Entry Permalink
  • an Entry Permalink element is identified by rel-bookmark
  • an Entry SHOULD have an Entry Permalink
  • an Entry Permalink element represents the concept of an Atom link in an entry
  • if the Entry Permalink is missing, use the URI of the page; if the Entry has an "id" attribute, add that as a fragment to the page URI to distinguish individual entries
Entry Updated
  • an Entry Updated element is identified by class name updated
  • an Entry Updated element represents the concept of Atom updated
  • an Entry SHOULD have an Entry Updated element
  • use the value class pattern date and time to encode the updated datetime
  • if there is no Entry Updated element,
    • use the Entry Published element, if present
    • otherwise the page is invalid hAtom
Entry Published
Entry Author
  • an Entry Author element is represented by class name author
  • an Entry Author element represents the concept of an Atom author
  • an Entry Author element MUST be encoded in an hCard
  • an Entry Author element SHOULD be encoded in an <address> element
  • an Entry SHOULD have at least one Entry Author element
  • an Entry MAY have more than one Entry Author elements
  • if the Entry Author is missing
    • find the Nearest In Parent <address> element(s) with class name author and that is/are a valid hCard
    • otherwise the entry is invalid hAtom

XMDP Profile

See hatom-profile.

Examples

See hatom-examples.

Examples in the wild

See hatom-examples-in-wild.

Implementations

See hatom-implementations.

Copyright

This specification is (C) 2005-2024 by the authors. However, the authors intend to submit (or already have submitted, see details in the spec) this specification to a standards body with a liberal copyright/licensing policy such as the GMPG, IETF, and/or W3C. Anyone wishing to contribute should read their copyright principles, policies and licenses (e.g. the GMPG Principles) and agree to them, including licensing of all contributions under all required licenses (e.g. CC-by 1.0 and later), before contributing.

  • Tantek: I release all my contributions to this specification into the public domain and I encourage the other authors to do so as well.
    • When all authors/editors have done so, we can remove the MicroFormatCopyrightStatement template reference and replace it with the MicroFormatPublicDomainContributionStatement.

Patents

This specification is subject to a royalty free patent policy, e.g. per the W3C Patent Policy, and IETF RFC3667 & RFC3668.

Semantic HTML Design Principles

  1. Reuse the schema (names, objects, properties, values, types, hierarchies, constraints) as much as possible from pre-existing, established, well-supported microformats.
  2. When new schema are needed, reuse the schema (names, objects, properties, values, types, hierarchies, constraints) as much as possible from pre-existing, established, well-supported other formats/standards by incorporation, following the microformats naming-principles. Re-do constraints expressed in the source standard from the perspective of microformats design principles and designed primarily for web authoring. Informatively mention source standard for reference purposes.
    1. For types with multiple components, use nested elements with class names equivalent to the names of the components.
    2. Plural components are made singular, and thus multiple nested elements are used to represent multiple text values that are comma-delimited.
  3. Use the most accurately precise semantic HTML building block for each object etc.
  4. Otherwise use a generic structural element (e.g. <span> or <div>), or the appropriate contextual element (e.g. an <li> inside a <ul> or <ol>).
  5. Use class names based on names from the original schema, unless the semantic HTML building block precisely represents that part of the original schema. If names in the source schema are case-insensitive, then use an all lowercase equivalent. Components names implicit in prose (rather than explicit in the defined schema) should also use lowercase equivalents for ease of use. Spaces in component names become dash '-' characters.
  6. Finally, if the format of the data according to the original schema is too long but still human readable/listenable, use <abbr> instead of a generic structural element, and place the literal longer data into the 'title' attribute (where abbr expansions go), and the briefer equivalent into the contents of the element itself. If however, the format of the literal longer data data is not human-friendly, instead of <abbr>, use the value-class-pattern or HTML5 <time>/<data> elements as most semantically appropriate.

References

Normative References

Informative References

Further Reading

Work in progress

This specification is a work in progress. As additional aspects are discussed, understood, and written, they will be added. There is a separate document where we are keeping our brainstorms and other explorations relating to hAtom:

Version 0.1

Version 0.1 was released 28 February 2006.

Discussions

Q&A

  • If you have any questions about hAtom, check the hAtom FAQ, and if you don't find answers, add your questions!

Issues

  • Please add any issues with the specification to the separate hAtom issues document.

See Also

Translations

Read the hAtom draft specification in additional languages: