@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_09459 a sh:SPARQLExecutable, sh:SPARQLSelectExecutable ;
  sh:prefixes _:sparql_examples_prefixes ;
  rdfs:comment '''Check there are no entries with crosslink annotations that do not have the keyword Isopeptide bond (KW-1017)'''@en ;
  schema:keywords "QC", "keyword" ;
  schema:target <https://sparql.nextprot.org/sparql> ;
  sh:select '''PREFIX : <http://nextprot.org/rdf/>
PREFIX cv: <http://nextprot.org/rdf/terminology/>

select distinct ?entry where {  # Include ?xlink if result is not 0 to identify problem site
  ?xlink a :UniprotPtmCv.
  cv:KW-1017 :related  ?xlink.
  ?entry :isoform ?iso.
  ?iso :crossLink ?mod.
  ?mod :term ?xlink.
  filter not exists {?mod :negativeEvidence ?negev} # No negative evidence
  filter not exists {?entry :isoform /:keyword /:term cv:KW-1017.}
}''' .