diff options
Diffstat (limited to 'examples/custom_eval.py')
| -rw-r--r-- | examples/custom_eval.py | 35 |
1 files changed, 18 insertions, 17 deletions
diff --git a/examples/custom_eval.py b/examples/custom_eval.py index 0b82b6b4..89975168 100644 --- a/examples/custom_eval.py +++ b/examples/custom_eval.py @@ -3,12 +3,12 @@ This example shows how a custom evaluation function can be added to handle certain SPARQL Algebra elements -A custom function is added that adds subClassOf "inference" when -asking for rdf:type triples. +A custom function is added that adds ``rdfs:subClassOf`` "inference" when +asking for ``rdf:type`` triples. Here the custom eval function is added manually, normally you would use setuptools and entry_points to do it: -i.e. in your setup.py: +i.e. in your setup.py:: entry_points = { 'rdf.plugins.sparqleval': [ @@ -18,14 +18,13 @@ i.e. in your setup.py: """ -import rdflib.plugins.sparql.paths import rdflib from rdflib.plugins.sparql.evaluate import evalBGP from rdflib.namespace import FOAF inferredSubClass = \ - rdflib.RDFS.subClassOf % '*' # any number of rdfs.subClassOf + rdflib.RDFS.subClassOf * '*' # any number of rdfs.subClassOf def customEval(ctx, part): @@ -50,18 +49,20 @@ def customEval(ctx, part): raise NotImplementedError() -# add function directly, normally we would use setuptools and entry_points -rdflib.plugins.sparql.CUSTOM_EVALS['exampleEval'] = customEval +if __name__=='__main__': -g = rdflib.Graph() -g.load("foaf.rdf") + # add function directly, normally we would use setuptools and entry_points + rdflib.plugins.sparql.CUSTOM_EVALS['exampleEval'] = customEval -# Add the subClassStmt so that we can query for it! -g.add((FOAF.Person, - rdflib.RDFS.subClassOf, - FOAF.Agent)) + g = rdflib.Graph() + g.load("foaf.rdf") -# Find all FOAF Agents -for x in g.query( - 'PREFIX foaf: <%s> SELECT * WHERE { ?s a foaf:Agent . }' % FOAF): - print x + # Add the subClassStmt so that we can query for it! + g.add((FOAF.Person, + rdflib.RDFS.subClassOf, + FOAF.Agent)) + + # Find all FOAF Agents + for x in g.query( + 'PREFIX foaf: <%s> SELECT * WHERE { ?s a foaf:Agent . }' % FOAF): + print x |