code: def ingest(cls, resource):
          
          _set = cls()
          for data in resource:
              _set.add_child(
                  cls.CitationClass.ingest(data, root=_set)
              )
          return _set
docs: Ingest a list of DTS Citation object (as parsed JSON-LD) and
          creates the Citation Graph
  
          :param resource: List of Citation objects from the
              DTS Collection Endpoint (as expanded JSON-LD)
          :type resource: list
          :return: Citation Graph