private static synchronized final CSSName addProperty(String propName) {
private final static synchronized CSSName addProperty( String propName ) {
    private static synchronized final CSSName addProperty(String propName) {        if ( ALL_PROPERTY_NAMES == null ) {            ALL_PROPERTY_NAMES = new TreeMap();        }        CSSName cssName = new CSSName(propName);        ALL_PROPERTY_NAMES.put(propName, cssName);        return cssName;    }