Set<String> symbols = new TreeSet<String>();
for (int i = 0, size = frames == null ? 0 : frames.size(); i < size; i++)
{
Frame f = (Frame) frames.get(i);
for (Iterator j = f.exportIterator(); j.hasNext(); )
{
DefineTag t = (DefineTag) j.next();
if (t.name != null)
{
symbols.add(t.name);