public static InternalRelation readRelation(
     final InternalVertex vertex, final Entry data, final StandardTitanTx tx) {
   RelationCache relation = tx.getEdgeSerializer().readRelation(data, true, tx);
   return readRelation(vertex, relation, data, tx, tx);
 }
 public static RelationCache readRelationCache(Entry data, StandardTitanTx tx) {
   return tx.getEdgeSerializer().readRelation(data, false, tx);
 }