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WebIDs and Content-Location

From: Henry Story <henry.story@bblfish.net>
Date: Fri, 13 Apr 2012 14:54:06 +0200
Message-Id: <ADD5CBF2-8185-49C7-BAA6-DCD15D0C389B@bblfish.net>
To: Linked Data community <public-lod@w3.org>, public-webid <public-webid@w3.org>, public-cwm-talk@w3.org, Owen Sacco <owen.sacco@deri.org>
I have an issue about canonicalisation (de-relativisation?) of URLs. cwm and rapper
don't return the same results, though cwm agrees with http://www.w3.org/RDF/Validator/

What is the full URL for the rdf:ID="me" in the XML returned below?
Is it 

 - <http://vmuss13.deri.ie/foafprofiles/hada#me> as cwm  ( cwm.py,v 1.198 2012-01-30) and the w3 validator state?
 or is it
 - <hada.rdf#me> as raptor 2.0.6 returns (bizarrely as a relative url though) and as I thought it should be.


$ curl -i http://vmuss13.deri.ie/foafprofiles/hada
HTTP/1.1 200 OK
Date: Fri, 13 Apr 2012 12:04:11 GMT
Server: Apache/2.2.9 (Debian) PHP/5.2.6-1+lenny12 with Suhosin-Patch
Content-Location: hada.rdf
Vary: negotiate
TCN: choice
Last-Modified: Fri, 13 Apr 2012 11:26:38 GMT
ETag: "8080-6af-4bd8dbeebb780;4bd8dbeebb780"
Accept-Ranges: bytes
Content-Length: 1711
Content-Type: application/rdf+xml

<?xml version="1.0" encoding="ISO-8859-1"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
      xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
      xmlns:foaf="http://xmlns.com/foaf/0.1/"
      xmlns:rsa="http://www.w3.org/ns/auth/rsa#"
      xmlns:cert="http://www.w3.org/ns/auth/cert#"
      xmlns:admin="http://webns.net/mvcb/">
<foaf:PersonalProfileDocument rdf:about="">
    <foaf:maker rdf:resource="#me"/>
    <foaf:primaryTopic rdf:resource="#me"/>
</foaf:PersonalProfileDocument>
<foaf:Person rdf:ID="me">
    <foaf:nick>HADAUser1</foaf:nick>
    <foaf:givenName>Jane</foaf:givenName>
    <foaf:familyName>Smith</foaf:familyName>
    <foaf:workplaceHomepage rdf:resource="http://hhs.gov"/>	
    <foaf:topic_interest rdf:resource="HEAR"/>
    <foaf:topic_interest rdf:resource="Accounting"/>

    <cert:key>
      <cert:RSAPublicKey rdf:ID="key1">
	<rdfs:label>HADA Admin</rdfs:label>
        <cert:modulus rdf:datatype="http://www.w3.org/2001/XMLSchema#hexBinary">95052F88477A3F1ADC1964AFD1AB7438F34EADEF22D9C5BDB8739E671F4626A347A3031E9FD4A5E2176D3048DA52DCA6AFFD67C81588A27A088A7CD27E2F2CBA2FF83DA90700797BE75BB9122FE5375E13BCFA55BE5504176886B0AC0BBB792D5221FE5295C75A3654385B8490A478A64AA117430F88E42852061230CD1C32EE2F01CD5FDD9D6DD4B757163CC9C1DB29BAC3EA9605D82D76AD7D5BE26D53DC9EA7A6C87369F53B4C2BBA149406E4A0FD5B921338DCB5B355D0DBBA95A238924678211ED997657ABC7FEDD28A93F8A5A19B463E72A17EFD204A80BEAFC41B841B079AE49FDBD28B62D01B9675D3508B4BAC98B6BE972A17C27C2415281C650121</cert:modulus>
        <cert:exponent rdf:datatype="http://www.w3.org/2001/XMLSchema#integer">65537</cert:exponent>
      </cert:RSAPublicKey>
    </cert:key>
</foaf:Person>
</rdf:RDF>

In my code  on read-write-web I use the returned Content-Location to form the base URL

   148           val loc = headers("Content-Location").headOption match {
   149             case Some(loc) =>  new URL(u,loc)
   150             case None => new URL(u.getProtocol,u.getAuthority,u.getPort,u.getPath)
   151           }
   152           res>>{ in=> modelFromInputStream(in,loc,encoding) }
   153 
( https://dvcs.w3.org/hg/read-write-web/file/c6520ef80d5c/src/main/scala/GraphCache.scala#l148 )

Where modelFromInputStream uses the Jena libraries like this:

    12   def modelFromInputStream(
    13       is: InputStream,
    14       base: URL,
    15       lang: Lang): Validation[Throwable, Model] =
    16     try {
    17       val m = ModelFactory.createDefaultModel()
    18       m.getReader(lang.jenaLang).read(m, is, base.toString)
    19       m.success
    20     } catch {
    21       case t =>  {
    22         logger.info("cought exception turning stream into model ",t)
    23         t.fail
    24       }
    25     }
( https://dvcs.w3.org/hg/read-write-web/file/c6520ef80d5c/src/main/scala/util/package.scala )


Social Web Architect
http://bblfish.net/
Received on Friday, 13 April 2012 12:54:41 UTC

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