CODEWITHSUNDEEP
python-2.7variablessparql
Boris
Boris

Reputation: 886

Passing Python variable in SPARQL Query

I have to run a loop that retrieves the labels of all the neighbour nodes of all the classes of an rdf ontology using SPARQL queries in rdflib. I know how to get the classes:

classes=graph.query("""select ?nodes WHERE { 
?nodes rdf:type owl:Class 
} limit 100""")

And I know how to get the neighbour nodes of a single URI: 

 example = graph.query("""select ?othernodes ?othernodesLabel where { 
bind (<http://human.owl#NCI_C12736> as ?mynode )
    ?mynode ?y ?othernodes.
    ?othernodes rdfs:label ?othernodesLabel
} limit 100""")

But what I need is to put these together in a for-loop that groups all the labels of the adjoining nodes of each class in one object, so that for every class there is a list that contains the labels of all the adjoining nodes.

Upvotes: 0

Views: 1236

Answers (1)

UninformedUser
UninformedUser

Reputation: 8465

If I understood your question correctly, the most simple solution would be to combine both queries and process the labels via Python code. The query would be

SELECT ?node ?othernodes ?othernodesLabel WHERE { 
    ?node rdf:type owl:Class .
    ?node ?y ?othernodes .
    ?othernodes rdfs:label ?othernodesLabel
} 
LIMIT 100

In your code, you can then process the returned data per each OWL class. Indeed you still have to loop over the resultset, thus, it's similar to loop over the result of your first query and execute the second query for each class.

Upvotes: 1

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