- From: Dan Brickley <danbri@danbri.org>
- Date: Mon, 19 Jan 2009 00:11:41 +0100
- To: RDFa <public-rdf-in-xhtml-tf@w3.org>
I'm trying to understand whether there is a subset of legal RDFa where namespaces and curie shortcuts aren't used, in other words, where full length URIs are used without abbrevation. http://validator.w3.org seems to think http://svn.foaf-project.org/foaftown/2009/rdfa/tests/t4.html is reasonable RDFa. But librdfa/raptor seems to think not. Here's the commandline check: Airbag:tests danbri$ rapper -i rdfa t4.html rapper: Parsing URI file:///Users/danbri/working/foaftown/2009/rdfa/tests/t4.html with parser rdfa rapper: Serializing with serializer ntriples _:bnode0 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . _:bnode0 <http://xmlns.com/foaf/0.1/homepage> <http://example.com/eve/> . _:bnode0 <http://xmlns.com/foaf/0.1/name> "Eve"@en . _:bnode1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . _:bnode1 <http://xmlns.com/foaf/0.1/homepage> <http://example.com/manu/> . _:bnode1 <http://xmlns.com/foaf/0.1/name> "Manu"@en . rapper: Parsing returned 6 triples Airbag:tests danbri$ rapper -i rdfa t1.html rapper: Parsing URI file:///Users/danbri/working/foaftown/2009/rdfa/tests/t1.html with parser rdfa rapper: Serializing with serializer ntriples _:bnode0 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . _:bnode0 <http://xmlns.com/foaf/0.1/homepage> <http://example.com/bob/> . _:bnode0 <http://xmlns.com/foaf/0.1/name> "Bob"@en . _:bnode1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . _:bnode1 <http://xmlns.com/foaf/0.1/homepage> <http://example.com/eve/> . _:bnode1 <http://xmlns.com/foaf/0.1/name> "Eve"@en . _:bnode2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . _:bnode2 <http://xmlns.com/foaf/0.1/homepage> <http://example.com/manu/> . _:bnode2 <http://xmlns.com/foaf/0.1/name> "Manu"@en . rapper: Parsing returned 9 triples Airbag:tests danbri$ Here's the main markup. The question is whether the 'Bob' section is wrong. <div xmlns:foaf="http://xmlns.com/foaf/0.1/"> <ul> <li typeof="http://xmlns.com/foaf/0.1/Person"> <a property="http://xmlns.com/foaf/0.1/name" rel="http://xmlns.com/foaf/0.1/homepage" href="http://example.com/bob/">Bob</a> </li> <li typeof="foaf:Person"> <a property="foaf:name" rel="foaf:homepage" href="http://example.com/eve/">Eve</a> </li> <li typeof="foaf:Person"> <a property="foaf:name" rel="foaf:homepage" href="http://example.com/manu/">Manu</a> </li> </ul> </div> I looked in the RDFa test cases and couldn't find one that checked this, though I may have missed something. Reading http://www.w3.org/TR/rdfa-syntax/#s_curieprocessing I have almost persuaded myself that the long form is acceptable: [[ Many of the attributes that hold URIs are also able to carry 'compact URIs' or CURIEs. A CURIE is a convenient way to represent a long URI, by replacing a leading section of the URI with a substitution token. It's possible for authors to define a number of substitution tokens as they see fit; the full URI is obtained by locating the mapping defined by a token from a list of in-scope tokens, and then simply concatenating the second part of the CURIE onto the mapped value. ]] ...on the reading that if we don't declare any namespaces/CURIE bindings, we can say the list of substitution tokens is empty, and just put the full thing in as the 'CURIE'. http://www.w3.org/TR/rdfa-syntax/#s_curies seems to make this reading harder though. curie := [ [ prefix ] ':' ] reference prefix := NCName reference := irelative-ref (as defined in [IRI]) Nevertheless, I get http://validator.w3.org/check?uri=http%3A%2F%2Fsvn.foaf-project.org%2Ffoaftown%2F2009%2Frdfa%2Ftests%2Ft4.html&charset=%28detect+automatically%29&doctype=Inline&group=0&user-agent=W3C_Validator%2F1.606 from the validator. What's up? If there's a way of squeezing thru the interpretation that full URIs are acceptable, this could help with identifying a subset that works easily in HTML5. cheers, Dan -- http://danbri.org/
Received on Sunday, 18 January 2009 23:12:21 UTC