docs: def collection_adapter(obj, request):
      '''
      Adapter for rendering a :class:`skosprovider.skos.Collection` to json.
  
      :param skosprovider.skos.Collection obj: The collection to be rendered.
      :rtype: :class:`dict`
      '''
      p = request.skos_registry.get_provider(obj.concept_scheme.uri)
      language = request.params.get('language', request.locale_name)
      label = obj.label(language)
      return {
          'id': obj.id,
          'type': 'collection',
          'uri': obj.uri,
          'label': label.label if label else None,
          'concept_scheme': {
              'uri': obj.concept_scheme.uri,
              'labels': obj.concept_scheme.labels
          },
          'labels': obj.labels,
          'notes': obj.notes,
          'sources': obj.sources,
          'members': _map_relations(obj.members, p, language),
          'member_of': _map_relations(obj.member_of, p, language),
          'superordinates':  _map_relations(obj.superordinates, p, language)
      }