Re: Is this possible in SPARQL?

Johann,

if you are using Jena you could try the extensions described at http://jena.sourceforge.net/ARQ/property_paths.html 
	

regards,
AndyL

On Aug 31, 2009, at 12:05 PM, Lee Feigenbaum wrote:
> Hi Johann,
>
> In current SPARQL, triple patterns can only query for fixed length  
> paths through the graph. There's no way to ask for arbitrary length  
> paths of owl:equivalentClass statements. If all owl:equivalentClass  
> statements are pairwise explicitly asserted in your store, then you  
> should be able to do:
>
> SELECT DISTINCT ?cl WHERE
> {
> { ?cl a owl:Class }
> OPTIONAL {
>    { ?cl rdfs:subClassOf ?sc . }
> 	UNION
>    { ?cl rdfs:subClassOf [ owl:equivalentClass ?sc ] }
>    FILTER (?cl != ?sc && ?sc != owl:Thing && ?sc != rdfs:Resource)
> }
> FILTER (!bound(?sc))
> }
>
> Lee
>
>> Since SERQL supports nested selects and the minus, any etc.
>> operators, this can be done in one SERQL query.
>


http://www.langegger.at
----------------------------------------------------------------------
Dipl.-Ing.(FH) Andreas Langegger
FAW - Institute for Application-oriented Knowledge Processing
Johannes Kepler University Linz
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