docs: def get_provider_metadata(self):
          """Gets the metadata for a provider.
  
          return: (osid.Metadata) - metadata for the provider
          *compliance: mandatory -- This method must be implemented.*
  
          """
          metadata = dict(self._mdata['provider'])
          metadata.update({'existing_id_values': self._my_map['providerId']})
          return Metadata(**metadata)