@prefix ex: <https://sparql.metanetx.org/.well-known/sparql-examples/> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix schema: <https://schema.org/> .
@prefix sh: <http://www.w3.org/ns/shacl#> .

ex:4 a sh:SPARQLExecutable,
        sh:SPARQLSelectExecutable ;
    rdfs:comment "Retrieve the MNXref reaction identifier, that corresponds to the KEGG reaction R00703 (lactate dehydrogenase)."@en ;
    sh:prefixes _:sparql_examples_prefixes ;
    sh:select """PREFIX keggR: <https://identifiers.org/kegg.reaction:>
PREFIX mnx: <https://rdf.metanetx.org/schema/>

# Retrieve the MNXref reaction identifier, that corresponds to
# the KEGG reaction *R00703* (lactate dehydrogenase).

SELECT ?reaction ?reference
WHERE {
    ?reaction a mnx:REAC .
    ?reaction mnx:reacXref keggR:R00703 .
    ?reaction mnx:reacRefer ?reference
}""" ;
    schema:target <https://rdf.metanetx.org/sparql/> .