Re: [Rdfapi-php-interest] Double rdf:type gives bug in RAP netapi?

[Richard C. <ri...@cy...>]

Hi Onno,

The RDF/XML as serialized by RAP is legal, and when parsed will  
produce exactly the same triples as the original snippet. Both  
serializations are equivalent.

Vowlidator seems to dislike the fact that RAP uses rdf:ID twice with  
the same value. That's allowed by the specs, although admittedly you  
could argue that it's bad style. (And indeed it's just a warning in  
Vowlidator, not an error.)

So it's not a RAP bug, but it's an indication that Vowlidator is a  
bit too picky :-)

You can safely ignore the warning.

Yours,
Richard


On 23 Aug 2006, at 13:28, Onno Paap wrote:

> Dear rdfapi-php team,
> The following examples are snippets from much larger OWL constructs.
> They have no meaning by themselves, just as illustration of the way
> the RAP netapi handles this.
> My question: does this example show an RAP bug?
> Onno Paap
>
> This piece of OWL code has no errors in Vowlidator:
> ============
> <rdf:RDF
> xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
> xmlns:owl="http://www.w3.org/2002/07/owl#"
> xml:base="http://www.15926.org/2006/02/onnopaap1">
> <owl:Class rdf:ID="AbstractObject">
> <rdf:type rdf:resource="#ClassOfAbstractObject"/>
> </owl:Class>
> <owl:Class rdf:ID="ClassOfAbstractObject"/>
> </rdf:RDF>
> ============
>
> Loaded in RAP gives 3 triples:
> ============
> 1.
>  Resource: http://www.15926.org/2006/02/onnopaap1#AbstractObject
>  RDF Node: rdf:type
>  RDF Node: owl:Class
> 2.
>  Resource: http://www.15926.org/2006/02/onnopaap1#AbstractObject
>  RDF Node: rdf:type
>  Resource: http://www.15926.org/2006/02/ 
> onnopaap1#ClassOfAbstractObject
> 3.
>  Resource: http://www.15926.org/2006/02/ 
> onnopaap1#ClassOfAbstractObject
>  RDF Node: rdf:type
>  RDF Node: owl:Class
> ============
>
> The RAP netapi makes this out of it:
> ============
> <?xml version="1.0" encoding="UTF-8" ?>
> <!--
>  Generated by RdfSerializer.php from RDF RAP.
> # http://www.wiwiss.fu-berlin.de/suhl/bizer/rdfapi/index.html !
> -->
> <rdf:RDF xml:base="http://www.15926.org/2006/02/onnopaap1#"
>  xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
>  xmlns:owl="http://www.w3.org/2002/07/owl#"
>  xmlns:ns1="http://www.15926.org/2006/02/onnopaap1#">
> <owl:Class rdf:ID="AbstractObject" />
> <ns1:ClassOfAbstractObject rdf:ID="AbstractObject" />
> <owl:Class rdf:ID="ClassOfAbstractObject" />
> </rdf:RDF>
> ============
>
> Which gives errors in Vowlidator:
> ============
> [1] WARNING - Parser Indication: http://www.15926.org/2006/02/ 
> onnopaap1#[15:53]:
>  {W105} Redefinition of ID: AbstractObject
>
> [2] WARNING - Parser Indication: http://www.15926.org/2006/02/ 
> onnopaap1#[13:37]:
>  {W105} Previous definition of 'AbstractObject'.
> ============
>
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