processor.getTransformer().getResultTreeHandler().startDocument();
// Output the action of the found root rule. All processing
// occurs from here. buildResultFromTemplate is highly recursive.
rootRule.execute(processor.getTransformer(), sourceTree, null);
processor.getTransformer().getResultTreeHandler().endDocument();
// Reset the top-level params for the next round.
// processor.m_topLevelParams = new Vector();