public final class Schem extends AbstractNBTItem implements WPObject {
    @SuppressWarnings("unchecked") // Guaranteed by Minecraft
    public Schem(CompoundTag tag, String fallBackName) {
        super(tag);
        final int version = getInt(TAG_VERSION);    //cont read version in schem3, get value "0"
                //...
        switch (version) {
            case 1:
                //...
                break;
            case 2:
                //...
                break;
            case 3:      //never go into this branch
                //...
                break;
            default:
                throw new IllegalArgumentException("Schem version " + version + " not supported");
        }
'''