PREFIX ex: <http://example.org/>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>

ex:IssueShape {
  ex:state [ex:unassigned ex:assigned];
  ex:reportedBy @ex:UserShape;
  ex:reportedOn xsd:dateTime;
  ex:reproducedBy @ex:UserShape*;
  ex:reproducedOn xsd:dateTime*
}

ex:UserShape {
  ex:name xsd:string;
  ex:sharedWith @ex:UserShape*
}