code: def _convert_reftype_to_jaeger_reftype(ref):
      
      if ref == link_module.Type.CHILD_LINKED_SPAN:
          return jaeger.SpanRefType.CHILD_OF
      if ref == link_module.Type.PARENT_LINKED_SPAN:
          return jaeger.SpanRefType.FOLLOWS_FROM
      return None
docs: Convert opencensus reference types to jaeger reference types.