Sequence seq = expression.eval(docs, contextSequence, contextItem);
Sequence seq = expression.eval(contextSequence, contextItem);
	public Sequence eval(		DocumentSet docs,		Sequence contextSequence,		Item contextItem)		throws XPathException {		Sequence seq = expression.eval(docs, contextSequence, contextItem);		ValueSequence result = new ValueSequence();		Item item;		for(SequenceIterator i = seq.iterate(); i.hasNext(); ) {			item = i.nextItem();			//System.out.println(item.getStringValue() + " converting to " + Type.getTypeName(requiredType));			result.add(item.convertTo(requiredType));		}		return result;	}