for (Iterator it = frame.symbolClass.class2tag.entrySet().iterator(); it.hasNext();)
{
Map.Entry e = (Map.Entry) it.next();
String className = (String) e.getKey();
DefineTag tag = (DefineTag) e.getValue();
def2symbol.put( className, tag );
}
if (Swc.FNORD) // release SWCs must have magic hash label per frame