@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_09638 a sh:SPARQLExecutable, sh:SPARQLSelectExecutable ;
  sh:prefixes _:sparql_examples_prefixes ;
  rdfs:comment '''Check there are no entries where the isoform sequence starts with M and the variant at position 1 does not start with M'''@en ;
  schema:keywords "QC", "variant" ;
  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 {
  ?entry :isoform ?iso.
  ?iso :variant ?var.
  ?iso :sequence ?seq.
  filter (regex(?seq, "^M"))
  ?var :start 1 .
  ?var :original ?ori.
  filter (!regex(?ori, "^M"))
}''' .