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

ex:NXQ_00105 a sh:SPARQLExecutable,
        sh:SPARQLSelectExecutable ;
    rdfs:comment "Proteins with at least one cross-reference to SMR (Swiss Model Repository) but no cross-references to PDB"@en ;
    sh:prefixes _:sparql_examples_prefixes ;
    sh:select """PREFIX : <http://nextprot.org/rdf/>
PREFIX db: <http://nextprot.org/rdf/db/>

SELECT DISTINCT ?entry WHERE {
 ?entry a :Entry.
 ?entry :reference / :provenance db:SMR.
 filter not exists { ?entry :reference / :provenance db:PDB }
}""" ;
    schema:keywords "3D structure",
        "cross-reference",
        "tutorial" ;
    schema:target <https://sparql.nextprot.org/sparql> .