code: private void loadCollisionGroups(MapTileCollision mapCollision, Media groupsConfig)
      {
          Verbose.info(INFO_LOAD_GROUPS, groupsConfig.getFile().getPath());
  
          this.groupsConfig = groupsConfig;
          final Xml nodeGroups = new Xml(groupsConfig);
          final CollisionGroupConfig config = CollisionGroupConfig.imports(nodeGroups, mapCollision);
          loadCollisionGroups(config);
      }
docs: Load the collision groups. All previous groups will be cleared.
  
  @param mapCollision The map tile collision owner.
  @param groupsConfig The configuration collision groups file.