this.maxVersion = this.minVersion;
        }
    }


    protected void initDisallowCompound ( String prop ) {
        if ( prop == null ) {
            return;
        }
        Set<String> disallow = new HashSet<>();
        StringTokenizer st = new StringTokenizer(prop, ",");
        while ( st.hasMoreTokens() ) {
            disallow.add(st.nextToken().trim());
        }