docs: def iriref_to_str(self, ref: ShExDocParser.IRIREF) -> str:
          """ IRIREF: '<' (~[\u0000-\u0020=<>\"{}|^`\\] | UCHAR)* '>' """
          rval = ref.getText()[1:-1].encode('utf-8').decode('unicode-escape')
          return rval if ':' in rval or not self.base else self.base.val + rval