add("class", &Loader::condition<ClassCondition>);
add_range<DropLevelCondition>("drop_level");
add_range<HeightCondition>("height");
add_range<ItemLevelCondition>("item_level");
add("linked_colors", &Loader::linked_colors);
add_range<LinkedSocketsCondition>("linked_sockets");
add("class", &Loader::condition<ClassCondition>);
add_range<DropLevelCondition>("drop_level");
add_range<HeightCondition>("height");
add_range<ItemLevelCondition>("item_level");
add("linked_colors", &Loader::linked_colors);
add_range<LinkedSocketsCondition>("linked_sockets");