code: def _is_valid_templates_dict(policy_templates_dict, schema=None):
          
  
          if not schema:
              schema = PolicyTemplatesProcessor._read_schema()
  
          try:
              jsonschema.validate(policy_templates_dict, schema)
          except ValidationError as ex:
              # Stringifying the exception will give us useful error message
              raise ValueError(str(ex))
  
          return True
docs: Is this a valid policy template dictionary
  
          :param dict policy_templates_dict: Data to be validated
          :param dict schema: Optional, dictionary containing JSON Schema representing policy template
          :return: True, if it is valid.
          :raises ValueError: If the template dictionary doesn't match up with the schema