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Regarding 6. Fragment Identifiers in http://www.w3.org/TR/2013/WD-rdf11-concepts-20130723/#section-fragID

From: Sebastian Hellmann <hellmann@informatik.uni-leipzig.de>
Date: Fri, 23 Aug 2013 16:44:22 +0200
Message-ID: <52177546.30008@informatik.uni-leipzig.de>
To: public-rdf-comments@w3.org
Hello all,
during my talk to Ivan (see other email) he pointed me to the changes 
made in the new working draft regarding the section Fragment Identifier.

Current recommendation: http://www.w3.org/TR/rdf-concepts/#section-fragID
New draft: 
http://www.w3.org/TR/2013/WD-rdf11-concepts-20130723/#section-fragID

Actually, I could live quite well with the old recommendation, but I 
have some questions regarding the new draft section.

Especially, I was looking at:
http://www.w3.org/2004/02/skos/core#Collection

It 303 redirects to HTML anchor within a table row at 
http://www.w3.org/2009/08/skos-reference/skos.html#Collection:
     <tr>
       <th colspan="2"><a id="Collection" 
href="#Collection">skos:Collection</a> </th>
     </tr>

Q1: to what does #Collection actually refer to? The anchor element, the 
text in the element or the whole tree, i.e. the current element, the 
text and all subelements , ok it's not very deep here, but you know what 
I mean. There is a difference, between a single node in a tree, the 
attributes of this node, the content of this node and the subtree with 
the node at its head.

Q2:
> the fragment |chapter1| may identify a document section via the 
> semantics of HTML's |@name| or |@id| attributes. The IRI |<#chapter1>| 
> should then be taken to denote 
> <http://www.w3.org/TR/rdf11-concepts/#dfn-denote> that same section in 
> any RDFa-encoded triples 
> <http://www.w3.org/TR/rdf11-concepts/#dfn-rdf-triple> within the same 
> document. Similarly, if the |@xml:id| attribute [XML-ID 
> <http://www.w3.org/TR/rdf11-concepts/#bib-XML-ID>] is used in an 
> RDF/XML document, then the corresponding IRI should be taken to denote 
> an XML element.

I am quite sure that the IRI 
http://www.w3.org/2004/02/skos/core#Collection  denotes more than the 
above mentioned anchor element. Is the sentence in the new working draft 
only relevant for RDFa+XTHML  ?


Q3: Does a fragment identifier in an application/rdf+xml or text/turtle  
information resource refer to (1) the actual content in the file or (2) 
the IRI in the RDF Graph or (3) the external "thing" or all three of 
them? Looking at http://www.w3.org/TR/skos-reference/skos.rdf#Collection 
. Is this now something in line 53 <rdf:Description 
rdf:about="#Collection"> or "A collection of concepts"

Q4: Reading the old recommendation, use of fragment id for text/plain 
(RFC 5147) in the RDF based NLP Interchange Format[1] was consistent. 
With the new text I am not sure.

Is there anything wrong with this in RDF 1.1:

Case 1:
curl -H "Accept: application/rdf+xml" 
"http://nlp2rdf.lod2.eu/nif-ws.php?informat=text&input=My+favourite+actress+is+Natalie+Portman#char=0,39"

(note that the URI 
http://nlp2rdf.lod2.eu/nif-ws.php?informat=text&input=My+favourite+actress+is+Natalie+Portman#char=0,39 
denotes the Unicode character sequence  in the nif:isString property.) .

<?xml version="1.0" encoding="UTF-8"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:nif="http://persistence.uni-leipzig.org/nlp2rdf/ontologies/nif-core#">

   <rdf:Description 
rdf:about="http://nlp2rdf.lod2.eu/nif-ws.php?informat=text&amp;input=My+favourite+actress+is+Natalie+Portman#char=0,39">
     <rdf:type 
rdf:resource="http://persistence.uni-leipzig.org/nlp2rdf/ontologies/nif-core#RFC5147String"/>
     <rdf:type 
rdf:resource="http://persistence.uni-leipzig.org/nlp2rdf/ontologies/nif-core#Context"/>
     <nif:beginIndex>0</nif:beginIndex>
     <nif:endIndex>39</nif:endIndex>
     <nif:isString>My favourite actress is Natalie Portman</nif:isString>
   </rdf:Description>

</rdf:RDF>

Case 2:
curl -H "Accept: text/plain" 
"http://nlp2rdf.lod2.eu/nif-ws.php?informat=text&input=My+favourite+actress+is+Natalie+Portman#char=0,39"
returns 39 characters:
"My favourite actress is Natalie Portman"


Sorry, if this has been discussed before.
All the best,
Sebastian

[1] http://svn.aksw.org/papers/2013/ISWC_NIF/public.pdf


-- 
Dipl. Inf. Sebastian Hellmann
Department of Computer Science, University of Leipzig
Events:
* NLP & DBpedia 2013 (http://nlp-dbpedia2013.blogs.aksw.org, Extended 
Deadline: *July 18th*)
* LSWT 23/24 Sept, 2013 in Leipzig (http://aksw.org/lswt)
Venha para a Alemanha como PhD: http://bis.informatik.uni-leipzig.de/csf
Projects: http://nlp2rdf.org , http://linguistics.okfn.org , 
http://dbpedia.org/Wiktionary , http://dbpedia.org
Homepage: http://bis.informatik.uni-leipzig.de/SebastianHellmann
Research Group: http://aksw.org
Received on Friday, 23 August 2013 14:44:51 UTC

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