Extract synonyms and label from Turtle file using SPARQL - sparql

Question

I am in a learning phase of SPARQL. I am working with a Turtle file to extract some information. The condition is: if the exact synonym has a substring 'stroke' or 'Stroke', the query should return all the synonyms and rdfs:label.
I am using below query but getting no output:
prefix oboInOwl: <http://www.geneontology.org/formats/oboInOwl#>
prefix obo: <http://purl.obolibrary.org/obo/>
prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>
Select * where {
?s ?p ?o .
rdfs:label <http://www.geneontology.org/formats/oboInOwl#hasExactSynonym> "stroke"^^xsd:string
}
Below is the sample Turtle file:
### https://ontology.aaaa.com/aaaa/meddra_10008196
:meddra_10008196
rdf:type owl:Class ;
<http://www.geneontology.org/formats/oboInOwl#hasDbXref> "DOID:6713" , "EFO:0000712" , "EFO:0003763" , "HE:A10008190" ;
<http://www.geneontology.org/formats/oboInOwl#hasExactSynonym>
"(cva) cerebrovascular accident" ,
"Acute Cerebrovascular Accident" ,
"Acute Cerebrovascular Accidents" ,
"Acute Stroke" ,
"Acute Strokes" ;
rdfs:label "Cerebrovascular disorder"#en ;
:hasSocs "Nervous system disorders [meddra:10029205]" , "Vascular disorders [meddra:10047065]" ;
:uid "6e46da69b727e4e924c31027cdf47b8a" .
I am expecting this output:
(cva) cerebrovascular accident
Acute Cerebrovascular Accident
Acute Cerebrovascular Accidents
Acute Stroke
Acute Strokes
Cerebrovascular disorder

Answer 1

With this triple pattern, you are querying for rdfs:label as subject, not as predicate:
rdfs:label <http://www.geneontology.org/formats/oboInOwl#hasExactSynonym> "stroke"^^xsd:string
What you are asking with this is: "Does the resource rdfs:label have the property oboInOwl:hasExactSynonym with the string value 'stroke'?"
But you want to ask this about the class (e.g., :meddra_10008196), not rdfs:label:
?class oboInOwl:hasExactSynonym "stroke" .
Finding matches
As you don’t want to find only exact string matches, you can use CONTAINS:
?class oboInOwl:hasExactSynonym ?matchingSynonym .
FILTER( CONTAINS(?matchingSynonym, "stroke") ) .
As you want to ignore case, you can query lower-cased synonyms with LCASE:
?class oboInOwl:hasExactSynonym ?matchingSynonym .
FILTER( CONTAINS(LCASE(?matchingSynonym), "stroke") ) .
Displaying results
To display the label and all synonyms in the same column, you could use a property path with | (AlternativePath):
?class rdfs:label|oboInOwl:hasExactSynonym ?labelOrSynonym .
Full query
# [prefixes]
SELECT ?class ?labelOrSynonym
WHERE {
?class rdfs:label|oboInOwl:hasExactSynonym ?labelOrSynonym .
FILTER EXISTS {
?class oboInOwl:hasExactSynonym ?matchingSynonym .
FILTER( CONTAINS(LCASE(?matchingSynonym), "stroke") ) .
}
}