docs: def getResourceMapPid(self):
          """Returns:
  
          str : PID of the Resource Map itself.
  
          """
          ore = [
              o for o in self.subjects(predicate=rdflib.RDF.type, object=ORE.ResourceMap)
          ][0]
          pid = [str(o) for o in self.objects(predicate=DCTERMS.identifier, subject=ore)][
              0
          ]
          return pid