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Dan Brickley experiments with using SPARQL queries to check on the vocabularies used in an RDF file.

Here’s a query that checks my FOAF file for properties that are in the FOAF namespace, but not declared in the FOAF RDFS file.

PREFIX foaf: 
PREFIX rdf: 
PREFIX owl: 
PREFIX rdfs: 
SELECT DISTINCT ?property
FROM 
FROM NAMED foaf:
WHERE {
    ?s ?property ?o
    GRAPH foaf: {
        OPTIONAL {
            ?property a ?t
            FILTER (?t = owl:ObjectProperty || ?t = owl:DatatypeProperty
                || ?t = rdf:Property || ?t = owl:FunctionalProperty
                || ?t = owl:InverseFunctionalProperty)
        }
    }
    FILTER (!BOUND(?t))
    FILTER (REGEX(STR(?property), "^http://xmlns\\.com/foaf/0\\.1/"))
}

This query actually finds some stuff — here are the results as of today:

-------------------------
| property              |
=========================
| foaf:withOrganization |
| foaf:hpmepage         |
| foaf:linkedWith       |
-------------------------

One’s a typo, and I’ve no idea how I got the idea that the other two were in FOAF.

SPARQL: SPellchecker And RDF Query Language!

This entry was posted on Monday, March 27th, 2006 at 3:36 pm and is filed under General, Semantic Web. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.