code: def language(self, value=None):
          
          if not (value is None):
              if (self.metadatatype == "native"):
                  self.metadata['language'] = value
              else:
                  self._language = value
          if self.metadatatype == "native":
              if 'language' in self.metadata:
                  return self.metadata['language']
              else:
                  return None
          else:
              return self._language
docs: No arguments: Get the document's language (ISO-639-3) from metadata
             Argument: Set the document's language (ISO-639-3) in metadata