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Re: a remark on the webid spec

From: Mischa Tuffield <mischa@mmt.me.uk>
Date: Wed, 14 Dec 2011 01:33:39 +0000
Cc: Pierre-Antoine Champin <pierre-antoine.champin@liris.cnrs.fr>
Message-Id: <58D56DE2-9163-412D-81E1-2290B1446A36@mmt.me.uk>
To: public-xg-webid XG <public-xg-webid@w3.org>
Hello, 

I thought I would have a look at the RDF and SPARQL in the spec too.  And I have a few comments too. These are but nit picking, will start with the RDF. 

The three fragments of RDF could all be interpreted to be slightly different. 

1. In the RDF/XML and the Turtle all of the foaf:Person IRIs are set explicitly to : https://bob.example/profile. But this is not the case in the RDFa, there is it dependant on the location of the html document. I would prefer all of them to be baseIRI dependant (like the RDFa). Regardless of the fixed adopted i think consistency is the way forward. 

You could either 
	a) change in the Turtle s;/bob:me/<#me>/ and from the bob @prefix 
or
	b) change the RDFa to be s/"#me"/"https://bob.example/profile#me"/

b) is probably an easier fix, but a) seems neater. 

2. In the RDFa the foaf:name "bob" inherits a language tag. I don't like language tagged names, they don't feel right. And plus there no language tag in the Turtle or the RDF/XML. 

You could add a xml:lang="" to the foaf:name span

3. Turtle consists of 9 triples, rdf/xml of 8, and the rdfa has 7 triples. 

Missing triples are basically foaf:weblog from the rdf/xml, and foaf:weblog along with rdf:label

In terms of the SPARQL. 

You could make the ASK query more specific. This is just a thought .... 

you could add a GRAPH verb or a FROM NAMED and make sure that the primaryTopic of a foaf Document is making that claim. 

something like below perhaps: 
PREFIX : <http://www.w3.org/ns/auth/cert#>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
ASK {
   GRAPH ?g {
    ?g foaf:primaryTopic ?webid .
     ?webid a foaf:Person . 
      ?webid :key [
         :modulus ?mod;
         :exponent ?exp;
      ] .
   }
}
But yeah great work on the spec people! 

Mischa

On 12 Dec 2011, at 14:24, Pierre-Antoine Champin wrote:

> Hi all,
> 
> having a look at the WebID spec, I spotted a few mistakes in the RDF/XML
> example:
> 
> * the rdfs namespace is not declared
> * the closing tag for rdfs:label misses the leading '/'
> * the datatypes xsd:hexBinary and xsd:integer should be expanded URIs,
> not CURIEs
> 
> best
> 
>  pa
> 

_____________________________
Mischa Tuffield PhD
http://mmt.me.uk/
http://mmt.me.uk/foaf.rdf#mischa
Received on Wednesday, 14 December 2011 01:34:17 GMT

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