message: Add Vlist's cache
  Add functions to load Vlist Cache
diff: @@ -49,6 +49,12 @@ public:
  std::string getStringByID(TYPE_ENTITY_LITERAL_ID _id);
  TYPE_ENTITY_LITERAL_ID getIDByString(std::string _str);
  + // functions to load Vlist's cache
  + void AddIntoSubCache(TYPE_ENTITY_LITERAL_ID _entity_id);
  + void AddIntoObjCache(TYPE_ENTITY_LITERAL_ID _entity_literal_id);
  + unsigned getSubListSize(TYPE_ENTITY_LITERAL_ID _sub_id);
  + unsigned getObjListSize(TYPE_ENTITY_LITERAL_ID _obj_id);
  +
  //===============================================================================
  //including IN-neighbor & OUT-neighbor
  