PREFIX ex: <http://ex.example/#>
PREFIX foaf: <http://xmlns.com/foaf/>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

<http://a.example/IssueShape> CLOSED {
  ex:reportedBy @<http://a.example/PersonShape>;
  ex:reproducedBy @<http://a.example/EmployeeShape>?
}

ABSTRACT <http://a.example/PersonShape> {
  (  foaf:name xsd:string
   | foaf:givenName xsd:string+;
     foaf:familyName xsd:string);
  foaf:mbox IRI
}

<http://a.example/UserShape>
    EXTENDS @<http://a.example/PersonShape> CLOSED {
  ex:representative @<http://a.example/EmployeeShape>
}

ABSTRACT <http://a.example/RepShape> {
  foaf:phone IRI+
}

<http://a.example/EmployeeShape>
    EXTENDS @<http://a.example/PersonShape>
    EXTENDS @<http://a.example/RepShape> CLOSED {
}