microformats2-parsing-rdf: Difference between revisions

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Draft Microformats2-to-RDF mapping
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
Tantek asked me to draft up a Microformats2-to-RDF mapping. It's pretty straightforward to do. This is rough and will need cleaning up.
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
== RDF model ==
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
In the document below, the RDF model is represented using the [https://en.wikipedia.org/wiki/Notation3 Notation3] syntax.
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
All RDF examples presume at least these basic external prefixes:
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
<source lang="text">
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
@prefix xsd:  <http://www.w3.org/2001/XMLSchema#> .
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
</source>
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
In addition, we shall use the profile defined on [[microformats-2]] as an RDF URI prefix:
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
<source lang="text">
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
@prefix uf: <http://microformats.org/profile/> .
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
</source>
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
== What is the subject? ==
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
In RDF, all data is in the form of subject, predicate, object triples. These map roughly to English statements. Subjects can be either URI references or blank nodes.
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
Mapping these adequately is problematic.
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
If the element which has the root class name for a microformats2 object also has an about attribute, that SHOULD be used to set the subject for the microformat.
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
If the element does not have an <code>'''about'''</code> attribute, or the HTML processor does not support parsing <code>'''about'''</code> attributes, then the subject for the microformat should be an RDF blank node.
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
If a parser is also parsing [[rdfa|RDFa]], it should use the same blank nodes as the subjects for microformats2 objects as it does for statements expressed in RDFa. Given this HTML:
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
<source lang="html4strict">
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
<div class="h-card p-name" typeof="foaf:Person" property="foaf:name">Tom Morris</div>
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
</source>
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
A microformats2 and RDFa-aware processor should produce Notation3 output with a singular blank node:
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
<source lang="text">
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
_:a a uf:h-card, foaf:Person;
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
  foaf:name "Tom Morris";
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
  uf:p-name "Tom Morris";
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
  rdfs:label "Tom Morris" .
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
</source>
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
It should not separate out these two resources into separate blank nodes:
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
<source lang="text">
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
_:a a uf:h-card;
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
  uf:p-name "Tom Morris";
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
  rdfs:label "Tom Morris" .
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
_:b a foaf:Person;
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
  foaf:name "Tom Morris" .
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
</source>
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
== Representing root class names ==
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
Root class names map neatly to <code>'''rdf:type'''</code>. In Notation3, this is represented with the shorthand <code>'''a'''</code>.
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
<source lang="html4strict">
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
<div class="h-card">Tom Morris</div>
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
</source>
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
<source lang="text">
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
_:bnode01 a uf:h-card .
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
</source>
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
This is compatible with the RDF specification, but differs from RDF best practice. As with Java and most programming languages, in RDF, it is customary to capitalize class names.
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
== Representing properties ==
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
Once we have inferred the class name, we need simply declare the properties.
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
For each <code>'''p-'''</code> prefixed property, an RDF statement should be produced with the subject being that of the microformats2 object, the property being the namespaced microformats property, and the object being either a plain literal or a language literal containing the string representation of the object (see language section below). This should be equal to the string value in the JSON output.
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
=== Multiple properties ===
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
If there are multiple instances of a property, this should result in multiple statements using the same property name.
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
This example hCard contains two category properties and two URL properties:
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
<source lang="html4strict">
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
<div class="h-card">
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
  <img class="u-photo" alt="photo of Mitchell"
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
      src="https://webfwd.org/content/about-experts/300.mitchellbaker/mentor_mbaker.jpg"/>
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
  <a class="p-name u-url"
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
    href="http://blog.lizardwrangler.com/"
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
    >Mitchell Baker</a>
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
(<a class="u-url"
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
    href="https://twitter.com/MitchellBaker"
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
    >@MitchellBaker</a>)
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
  <span class="p-org">Mozilla Foundation</span>
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
  <p class="p-note">
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
    Mitchell is responsible for setting the direction and scope of the Mozilla Foundation and its activities.
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
  </p>
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
  <span class="p-category">Strategy</span>
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
  <span class="p-category">Leadership</span>
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
</div>
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
</source>
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
 
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
<source lang="text">
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
_:lizardwrangler a uf:h-card;
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
  uf:u-photo <https://webfwd.org/content/about-experts/300.mitchellbaker/mentor_mbaker.jpg>;
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
  uf:p-name "Mitchell Baker";
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
  rdfs:label "Mitchell Baker";
MAKE GOD DO WHAT I WANT.MAKE ALLAH DO WHAT I WANT.PUT I TO HEAVEN GOD.PUT I TO HEAVEN ALLAH.
  uf:u-url <http://blog.lizardwrangler.com>;
  uf:u-url <https://twitter.com/MitchellBaker>;
  uf:p-org "Mozilla Foundation";
  uf:p-note "Mitchell is responsible for setting the direction and scope of the Mozilla Foundation and its activities.";
  uf:p-category "Strategy";
  uf:p-category "Leadership" .
</source>
 
(In Notation3, it is possible to use commas as a shorthand form to represent multiple statements. This has been avoided in order to better illustrate the point in question.)
 
To convert from RDF to JSON, one should take all statements that have the same subject and property and group them together into an array.
 
=== Language ===
RDF allows three types of literal: plain literals, language literals and typed literals.
 
Typed literals contain a datatype annotation, language literals contain a language annotation (the same ISO country codes as is used in HTML's <code>'''lang'''</code> attribute and XML's <code>'''xml:lang'''</code> attribute).
 
Processors should work out the language tag (if any) of the elements containing microformat properties (using the latest RDFa specification) and emit language-tagged literals for p- prefixed properties. If no language tag is set in the HTML, emit plain literals for all p- prefixed properties.
 
For instance:
 
<source lang="html4strict">
<div class="h-card p-name" lang="ja">内閣総理大臣</div>
 
<div class="h-card p-name" lang="he">בִּנְיָמִין נְתַנְיָהוּ</div>
</source>
 
<source lang="text">
_:a a uf:h-card;
  uf:p-name "内閣総理大臣"@ja .
 
_:b a uf:h-card;
  uf:p-name "בִּנְיָמִין נְתַנְיָהוּ"@he .
</source>
 
=== rdfs:label ===
It is generally good practice for each resource to have an rdfs:label property. This maps to p-name.
 
Using Notation3 rules syntax:
 
<source lang="text">
@prefix log: <http://www.w3.org/2000/10/swap/log#> .
@forall ?s ?o .
{ :s uf:p-name :o . } log:implies { :s rdfs:label :o . } .
</source>
 
It is arguable that one may wish to then omit the p-name property from RDF representations of Microformats2 objects. The minor cost of extra duplication is outweighed by ensuring faithful representation and the ability to bidirectionally convert from RDF representations and JSON representations of Microformats2 objects.
 
== Representing nested microformats ==
 
This is easy. Each new object becomes a new RDF resource, and there is a relationship going from the parent object to the child object.
 
<source lang="html4strict">
<div class="h-event">
  <a class="p-name u-url" href="http://indiewebcamp.com/2012">
    IndieWebCamp 2012
  </a>
  from <time class="dt-start">2012-06-30</time>
  to <time class="dt-end">2012-07-01</time> at
  <span class="p-location h-card">
    <a class="p-name p-org u-url" href="http://geoloqi.com/">
      Geoloqi
    </a>,
    <span class="p-street-address">920 SW 3rd Ave. Suite 400</span>,
    <span class="p-locality">Portland</span>,
    <abbr class="p-region" title="Oregon">OR</abbr>
  </span>
</div>
</source>
 
In Notation3, this would emit:
 
<source lang="text">
_:hevent1 a uf:h-event;
  rdfs:label "IndieWebCamp 2012";
  uf:p-name "IndieWebCamp 2012";
  uf:u-url <http://indiewebcamp.com/2012>;
  uf:dt-start "2012-06-30"^^xsd:date;
  uf:dt-end "2012-07-01"^^xsd:date;
  uf:location [
    a uf:h-card;
    rdfs:label "Geoloqi";
    uf:p-name "Geoloqi";
    uf:p-org "Geoloqi";
    uf:u-url <http://geoloqi.com/>;
    uf:p-street-address "920 SW 3rd Ave. Suite 400";
    uf:p-locality "Portland";
    uf:p-region "Oregon" .
  ].
</source>
 
== Mapping ==
:''See also'': [[microformats2-rdf-mapping]]
 
The RDF semantics of an hCard can be declared as an RDF document available from microformats.org. This can be used by RDF-minded parsers to draw inferences. In the case of hCard...
 
<source lang="text">
uf:h-card a owl:Class;
  owl:sameAs <http://www.w3.org/2006/vcard/ns#VCard> .
</source>
 
Equivalent properties can also be declared:
 
<source lang="text">
uf:p-phone a owl:DatatypeProperty;
  owl:sameAs <http://xmlns.com/foaf/0.1/phone>;
    <http://schema.org/telephone> .
</source>
 
== Advanced: parsing microformats in context ==
=== Representative hCard parsing ===
:''See also:'' [[representative-hcard-parsing#representative_hCard_algorithm|representative hCard algorithm]], which operates on an already parsed data model, and thus works the same way.
 
If the parser is able to infer that a representative hCard is present on the page, one can represent this by using <var>foaf:primaryTopic</var> from the [http://xmlns.com/foaf/spec/#term_primaryTopic FOAF specification].
 
<source lang="text">
<> foaf:primaryTopic _:a .
 
_:a a uf:h-card;
  uf:p-name "Tom Morris" .
</source>

Revision as of 23:36, 3 April 2013

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