Using SPARQL describe queries

This post will show how to use describe queries from the stardog CLI but the query is not database specific. You can actually export the triples in different formats:

• NTRIPLES
• RDFXML
• TURTLE
• TRIG
• TRIX
• N3
• NQUADS

Let's try out a simple describe query in 2 formats.

$ ./stardog query  -c http://localhost:5822/nxp -q "DESCRIBE <http://data.nxp.com/basicTypes/PH3330L>" -f RDFXML

<?xml version="1.0" encoding="UTF-8"?>
<rdf:RDF
  xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
  xmlns:owl="http://www.w3.org/2002/07/owl#"
  xmlns:foaf="http://xmlns.com/foaf/0.1/"
  xmlns:xsd="http://www.w3.org/2001/XMLSchema#"
  xmlns:skos="http://www.w3.org/2004/02/skos/core#"
  xmlns:nxp="http://purl.org/nxp/schema/v1/"
  xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">

<rdf:Description rdf:about="http://data.nxp.com/basicTypes/PH3330L">
  <rdf:type rdf:resource="http://purl.org/nxp/schema/v1/BasicType"/>
  <nxp:productStatusDate rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2011-10-28</nxp:productStatusDate>
  <skos:prefLabel xml:lang="en-us">N-channel TrenchMOS logic level FET</skos:prefLabel>
  <nxp:productStatus rdf:resource="http://purl.org/nxp/schema/v1/endOfLife"/>
  <foaf:homepage rdf:resource="http://www.nxp.com/pip/PH3330L"/>
  <nxp:typeNumber>PH3330L</nxp:typeNumber>
  <nxp:mechanicalOutline rdf:resource="http://data.nxp.com/packageOutlineVersion/SOT669"/>
</rdf:Description>

</rdf:RDF>

$ ./stardog query  -c http://localhost:5822/nxp -q "DESCRIBE <http://data.nxp.com/basicTypes/PH3330L>" -f TURTLE

@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix nxp: <http://purl.org/nxp/schema/v1/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .

<http://data.nxp.com/basicTypes/PH3330L> a nxp:BasicType ;
        nxp:productStatusDate "2011-10-28"^^xsd:date ;
        skos:prefLabel "N-channel TrenchMOS logic level FET"@en-us ;
        nxp:productStatus nxp:endOfLife ;
        foaf:homepage <http://www.nxp.com/pip/PH3330L> ;
        nxp:typeNumber "PH3330L" ;
        nxp:mechanicalOutline <http://data.nxp.com/packageOutlineVersion/SOT669> .

You can also return ALL object graphs of a specific type. This will wrap all descriptions in a rdf:RDF tag.

./stardog query  -c http://localhost:5822/nxp -f RDFXML -q "
PREFIX nxp:   <http://purl.org/nxp/schema/v1/>
DESCRIBE ?s
WHERE {
  ?s a nxp:BasicType.
}
" 

<?xml version="1.0" encoding="UTF-8"?>
<rdf:RDF
 xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
 xmlns:owl="http://www.w3.org/2002/07/owl#"
 xmlns:foaf="http://xmlns.com/foaf/0.1/"
 xmlns:xsd="http://www.w3.org/2001/XMLSchema#"
 xmlns:skos="http://www.w3.org/2004/02/skos/core#"
 xmlns:nxp="http://purl.org/nxp/schema/v1/"
 xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">

<rdf:Description rdf:about="http://data.nxp.com/basicTypes/74AUP1G57GW">
 <rdf:type rdf:resource="http://purl.org/nxp/schema/v1/BasicType"/>
 <nxp:productStatusDate rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2011-10-20</nxp:productStatusDate>
    ...
</rdf:Description>

<rdf:Description rdf:about="http://data.nxp.com/basicTypes/74AUP1G58GW">
 <rdf:type rdf:resource="http://purl.org/nxp/schema/v1/BasicType"/>
 <nxp:productStatusDate rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2011-10-14</nxp:productStatusDate>
    ...
</rdf:Description>

</rdf:RDF>