- From: Butler, Mark <Mark_Butler@hplb.hpl.hp.com>
- Date: Wed, 22 Oct 2003 16:20:12 +0100
- To: "'www-rdf-dspace@w3.org'" <www-rdf-dspace@w3.org>
Hi team, After some discussion with Andy this morning I have been playing with some scripts for analysing schemas and instance data. I'm sure these things are obvious to RDF experts here, but for people who are not these simple examples demonstrate how we can use RDQL and Unix command line tools to query RDF instance data and schemas. 1. Determine all the properties defined in an RDF schema written in N3 format: java jena.rdfquery --n3 -data "$1" "SELECT ?r WHERE (?r, <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>, <http://www.w3.org/1999/02/22-rdf-syntax-ns#Property>)" | sort | uniq 2. Determine all the classes defined in an RDF schema written in N3 format: java jena.rdfquery --n3 -data "$1" "SELECT ?r WHERE (?r, <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>, <http://www.w3.org/2000/01/rdf-schema#Class>)" | sort | uniq 3. Determine all the properties used in an RDF file written in N3 format matching the namespace http://web.mit.edu/simile/2003/10/vraCore3 java jena.rdfquery --n3 -data "$1" "SELECT ?p WHERE (?r, ?p, ?v) AND ?p =~ m!http://web.mit.edu/simile/2003/10/vraCore3!" | sort | uniq 4. Determine all the classes used in an RDF file written in N3 format matching the namespace http://web.mit.edu/simile/2003/10/vraCore3 java jena.rdfquery --n3 -data "$1" "SELECT ?v WHERE (?r, <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>, ?v) AND ?v =~ m!http://web.mit.edu/simile/2003/10/vraCore3!" | sort | uniq 5. Determine all the property values used in an RDF file written in N3 format matching the namespace http://web.mit.edu/simile/metadata/artstor/$2 java jena.rdfquery --n3 -data "$1" "SELECT ?v WHERE (?r, ?p, ?v) AND ?v =~ m!http://web.mit.edu/simile/metadata/artstor/$2!" | sort | uniq We can use these tools together - for example we might want to check that the properties and classes used in some instance data match those defined in a given schema, or compare two different schemas that describe the same model (e.g. VRA). Dr Mark H. Butler Research Scientist HP Labs Bristol mark-h_butler@hp.com Internet: http://www-uk.hpl.hp.com/people/marbut/
Received on Wednesday, 22 October 2003 11:21:17 UTC