<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def ParseObjs(self, objs, type_names):
 """Parse one or more objects by testing if it is a known RDF class."""

    for obj in objs:
      for type_name in self._RDFTypes(type_names):
        if isinstance(obj, self._GetClass(type_name)):
          yield obj