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RDF vocabulary best practices question...

From: Manu Sporny <msporny@digitalbazaar.com>
Date: Wed, 09 Jul 2008 23:02:46 -0400
Message-ID: <48757BD6.7050503@digitalbazaar.com>
To: RDFa mailing list <public-rdf-in-xhtml-tf@w3.org>

Hi all,

I'm working on getting a first draft of the Audio RDF vocabulary
completed. It is purely an adaptation of the work that's been happening
over the last two years in the Microformats community as well as the
other communities with which we are involved. Here's the persistent URL:

http://purl.org/media/audio

There is RDFa embedded in the document listed above, the triples are
attached in TURTLE notation.

The original cut of hAudio RDFa required the page author to include the
following namespaces to mark up 80% of the songs and albums we analyzed:

xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:media="http://purl.org/media"
xmlns:audio="http://purl.org/media/audio"
xmlns:commerce="http://some-future-url.org/commerce"

That's too many namespaces for something that is supposed to be simple
to use. Ideally, to help the page author, it would be nice if they only
had to include one vocabulary for 80% of the markup use cases we've
collected (after analyzing over 120 unique music websites). Here's the
XHTML that we'd like to write:

<div about="start-wearing-purple"
     xmlns:audio="http://purl.org/media/audio"
     typeof="audio:Recording">
   <span property="audio:title">Start Wearing Purple</span> by
   <span property="audio:creator">Gogol Bordello</span>
</div>

The questions are:

Is adding synonyms into your vocabulary a valid best practice? For
example, is having audio:title specified as owl:sameAs dc:title acceptable?

If it is acceptable, is there a certain way it should be marked up?
Should owl:sameAs be used, or something else? Any other comments or
criticisms on the document as it evolves would be great.

What follows are the RDF triples that are generated by the document when
passed through librdfa:

---------------------------------------------------------------------------

@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix dc: <http://purl.org/dc/elements/1.1/> .
@prefix vs: <http://www.w3.org/2003/06/sw-vocab-status/ns#> .
<http://purl.org/media/audio>
   <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
      <http://www.w3.org/2002/07/owl#Ontology> .
<http://purl.org/media/audio>
   <http://purl.org/dc/elements/1.1/title>
      "The Audio Vocabulary" .
<http://purl.org/media/audio>
   <http://purl.org/dc/elements/1.1/description>
      "The easiest way to use the Audio RDF Vocabulary is to embed
semantic audio metadata in your web pages using RDFa. For examples on
how to do this, please visit the <a href="http://rdfa.info/wiki">Audio
RDF Vocabulary section on the RDFa wiki</a>."^^rdf:XMLLiteral .
<http://purl.org/media/audio#Recording>
   <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
      <http://www.w3.org/2002/07/owl#Class> .
<http://purl.org/media/audio#Recording>
   <http://www.w3.org/2000/01/rdf-schema#label>
      "Recording" .
<http://purl.org/media/audio#Recording>
   <http://www.w3.org/2000/01/rdf-schema#comment>
      "A recording of acoustic signals." .
<http://purl.org/media/audio#Album>
   <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
      <http://www.w3.org/2002/07/owl#Class> .
<http://purl.org/media/audio#Album>
   <http://www.w3.org/2000/01/rdf-schema#label>
      "Album" .
<http://purl.org/media/audio#Album>
   <http://www.w3.org/2000/01/rdf-schema#comment>
      "A collection of one or more audio recordings." .
<http://purl.org/media/audio#title>
   <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
      <http://www.w3.org/2002/07/owl#DatatypeProperty> .
<http://purl.org/media/audio#title>
   <http://purl.org/dc/elements/1.1/title>
      "title" .
<http://purl.org/media/audio#title>
   <http://www.w3.org/2003/06/sw-vocab-status/ns#term_status>
      "stable" .
<http://purl.org/media/audio#title>
   <http://www.w3.org/2000/01/rdf-schema#comment>
      "title of the audio recording" .
<http://purl.org/media/audio#title>
   <http://www.w3.org/2000/01/rdf-schema#range>
      <http://www.w3.org/2001/XMLSchema#string> .
<http://purl.org/media/audio#title>
   <http://www.w3.org/2002/07/owl#sameAs>
      <http://purl.org/dc/elements/1.1/title> .
<http://purl.org/media/audio#title>
   <http://www.w3.org/2002/07/owl#sameAs>
      <http://purl.org/media#title> .
<http://purl.org/media/audio#creator>
   <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
      <http://www.w3.org/2002/07/owl#DatatypeProperty> .
<http://purl.org/media/audio#creator>
   <http://purl.org/dc/elements/1.1/title>
      "creator" .
<http://purl.org/media/audio#creator>
   <http://www.w3.org/2003/06/sw-vocab-status/ns#term_status>
      "stable" .
<http://purl.org/media/audio#creator>
   <http://www.w3.org/2000/01/rdf-schema#comment>
      "The primary creator or performer of the audio recording." .
<http://purl.org/media/audio#creator>
   <http://www.w3.org/2000/01/rdf-schema#range>
      <http://www.w3.org/2001/XMLSchema#string> .
<http://purl.org/media/audio#creator>
   <http://www.w3.org/2000/01/rdf-schema#range>
      <http://xmlns.com/foaf/0.1/Agent> .
<http://purl.org/media/audio#creator>
   <http://www.w3.org/2000/01/rdf-schema#range>
      <http://www.w3.org/2001/vcard-rdf/3.0> .
<http://purl.org/media/audio#creator>
   <http://www.w3.org/2002/07/owl#sameAs>
      <http://purl.org/dc/elements/1.1/creator> .
<http://purl.org/media/audio#creator>
   <http://www.w3.org/2002/07/owl#sameAs>
      <http://purl.org/media#creator> .
<http://purl.org/media/audio#contributor>
   <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
      <http://www.w3.org/2002/07/owl#DatatypeProperty> .
<http://purl.org/media/audio#contributor>
   <http://purl.org/dc/elements/1.1/title>
      "contributor" .
<http://purl.org/media/audio#contributor>
   <http://www.w3.org/2003/06/sw-vocab-status/ns#term_status>
      "stable" .
<http://purl.org/media/audio#contributor>
   <http://www.w3.org/2000/01/rdf-schema#comment>
      "An entity that performed a contribution to the creation of the
audio recording." .
<http://purl.org/media/audio#contributor>
   <http://www.w3.org/2000/01/rdf-schema#range>
      <http://www.w3.org/2001/XMLSchema#string> .
<http://purl.org/media/audio#contributor>
   <http://www.w3.org/2000/01/rdf-schema#range>
      <http://xmlns.com/foaf/0.1/Agent> .
<http://purl.org/media/audio#contributor>
   <http://www.w3.org/2000/01/rdf-schema#range>
      <http://www.w3.org/2001/vcard-rdf/3.0> .
<http://purl.org/media/audio#contributor>
   <http://www.w3.org/2002/07/owl#sameAs>
      <http://purl.org/dc/elements/1.1/contributor> .
<http://purl.org/media/audio#contributor>
   <http://www.w3.org/2002/07/owl#sameAs>
      <http://purl.org/media#contributor> .

---------------------------------------------------------------------------

-- manu

-- 
Manu Sporny
President/CEO - Digital Bazaar, Inc.
blog: Bitmunk 3.0 Website Launches
http://blog.digitalbazaar.com/2008/07/03/bitmunk-3-website-launches
Received on Thursday, 10 July 2008 03:03:27 GMT

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