[oslc-core] Repost: Relative URIs in rdf:about of OSCL resources

[Arthur Ryman]

Olivier,

You are correct. RDF/XML does allow relative URIs in certain places, 
including rdf:about. The URI is resolved into an absolute URI using the 
XML Base rules. [1] You can include an xml:base attribute. If that's 
missing, the base is the document URI.

Your link points to the application/xml section of the spec which gives 
guidelines for producing an XML representation that would be valid 
RDF/XML, but that would not use all the features of RDF/XML and therefore 
be suitable for processing as XML. The intention was to eliminate 
flexibility so it would be easier to parse. 

When you produce application/rdf+xml, use RDF/XML, there are no 
constraints, i.e. just follow the W3C spec.

Are you asking to clarify the use of relative URIs in the application/xml 
case?

[1] http://www.w3.org/TR/REC-rdf-syntax/#section-Syntax-ID-xml-base

Regards, 
___________________________________________________________________________ 

Arthur Ryman, PhD, DE

Chief Architect, Project and Portfolio Management
IBM Software, Rational
Markham, ON, Canada | Office: 905-413-3077, Cell: 416-939-5063





From:
Olivier Berger <olivier.berger at it-sudparis.eu>
To:
"oslc-core at open-services.net" <oslc-core at open-services.net>
Date:
01/18/2011 09:28 AM
Subject:
[oslc-core] Repost:  Relative URIs in rdf:about of OSCL resources
Sent by:
oslc-core-bounces at open-services.net



Hi.

May I kindly ask again if some have any insights on this (thy shall not
post on days before Christmas ? ;) ?

Le jeudi 23 décembre 2010 à 16:14 +0100, Olivier Berger a écrit :
> Hi.
> 
> I may be mistaken, but RDF+XML allows to set relative URIs for rdf:about
> properties.
> 
> For instance the document retrieved from
> http://example.com/blogs/entries may contain :
> 
>         <rdf:RDF 
>            xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
>            xmlns:dcterms="http://purl.org/dc/terms/" 
>            xmlns:foaf="http://xmlns.com/foaf/0.1/" 
>            xmlns:oslc_blog="http://open-services.net/ns/bogus/blogs#">
> 
>            <oslc_blog:Entry
>               rdf:about="#1">
> 
>               <dcterms:title>I love trash</dcterms:title>
> SNIP
> 
> Which would describe an oslc_blog:Entry resource whose URI would be
> http://example.com/blogs/entries#1
> 
> Then, similarly, rdf:about="" would be valid and refer to the document
> itself (http://example.com/blogs/entries) in such case.
> 
> Still, the OSLC specs in [0] mention :
> "# 1.0 Open the XML root element <rdf:RDF> and include all required 
namespace declarations
>  # 2.0 Open the XML element as a first child of the XML root element 
using the Resource's Prefixed Name
> 
>     * 2.1 Add to the XML element the rdf:about attribute set to the URI 
of the resource"
> 
> So, would rdf:about="" be a valid content for a document produced by an
> OSLC compliant provider (of course, it'd be better accessed from a
> "stable" URL) ?
> 
> Thanks in advance.
> 
> Best regards,
> 
> [0] 
http://open-services.net/bin/view/Main/OSLCCoreSpecAppendixRepresentations#Steps_to_generate_an_XML_represe


-- 
Olivier BERGER <olivier.berger at it-sudparis.eu>
http://www-public.it-sudparis.eu/~berger_o/ - OpenPGP-Id: 2048R/5819D7E8
Ingénieur Recherche - Dept INF
Institut TELECOM, SudParis (http://www.it-sudparis.eu/), Evry (France)


_______________________________________________
Oslc-Core mailing list
Oslc-Core at open-services.net
http://open-services.net/mailman/listinfo/oslc-core_open-services.net