code: def _handle_properties(self, stmt: Statement, sctx: SchemaContext) -> None:
          
          nextval = 0
          for est in stmt.find_all("enum"):
              if not sctx.schema_data.if_features(est, sctx.text_mid):
                  continue
              label = est.argument
              vst = est.find1("value")
              if vst:
                  val = int(vst.argument)
                  self.enum[label] = val
                  if val > nextval:
                      nextval = val
              else:
                  self.enum[label] = nextval
              nextval += 1
docs: Handle **enum** statements.