/rhino/xmlimplsrc/org/mozilla/javascript/xmlimpl/QName.java
int id = f.hasTag( ) ;
int id = f.methodId ( ) ;
@Override public Object execIdCall( IdFunctionObject f, Context cx, Scriptable scope, Scriptable thisObj, Object[] args) { if (!f.hasTag(QNAME_TAG)) { return super.execIdCall(f, cx, scope, thisObj, args); } <extra_id_0> switch (id) { case Id_constructor: return jsConstructor(cx, (thisObj == null), args); case Id_toString: return realThis(thisObj, f).toString(); case Id_toSource: