code: def get_cts_property(self, prop, lang=None):
          
          x = {
              obj.language: obj for obj in self.metadata.get(RDF_NAMESPACES.CTS.term(prop))
          }
          if lang is not None:
              if lang in x:
                  return x[lang]
              return next(x.values())
          return x
docs: Set given property in CTS Namespace
  
          .. example::
              collection.get_cts_property("groupname", "eng")
  
          :param prop: Property to get (Without namespace)
          :param lang: Language to get for given value
          :return: Value or default if lang is set, else whole set of values
          :rtype: dict or Literal