break;
	public Sequence eval(Sequence contextSequence, Item contextItem) throws XPathException {        if (context.getProfiler().isEnabled()) {            context.getProfiler().start(this);                   context.getProfiler().message(this, Profiler.DEPENDENCIES, "DEPENDENCIES", Dependency.getDependenciesName(this.getDependencies()));            if (contextSequence != null)                context.getProfiler().message(this, Profiler.START_SEQUENCES, "CONTEXT SEQUENCE", contextSequence);            if (contextItem != null)                context.getProfiler().message(this, Profiler.START_SEQUENCES, "CONTEXT ITEM", contextItem.toSequence());        }                Sequence seq;        Sequence result;        Item item; 		if (contextSequence == null || contextSequence.isEmpty()) 			result = Sequence.EMPTY_SEQUENCE;                    		//If we have one argumment, we take it into account		if (getSignature().getArgumentCount() > 0) 			seq = getArgument(0).eval(contextSequence, contextItem);		//Otherwise, we take the context sequence and we iterate over it		else			seq = contextSequence; 				        result = new ValueSequence();		int j = 0;		for (SequenceIterator i = seq.iterate(); i.hasNext(); j++) {			item = i.nextItem();            if (!Type.subTypeOf(item.getType(), Type.NODE))            	throw new XPathException("FOTY0011: item is not a node; got '" + item + "'");            //TODO : how to improve performance ?            Node n = ((NodeValue)item).getNode();    		switch(n.getNodeType()) {    			case Node.ELEMENT_NODE:    			case Node.ATTRIBUTE_NODE:    				result.add(new StringValue(n.getNodeName()));    				break;    			case Node.PROCESSING_INSTRUCTION_NODE:    				result.add(new StringValue(((ProcessingInstruction)n).getTarget()));                    break;    			case Node.DOCUMENT_NODE:    			case Node.TEXT_NODE:    				result.add(new StringValue(""));                //TODO : what kind of default do we expect here ? -pb    			default:    				throw new XPathException("Unhandled node type: '" + n.getNodeType() + "'");    		}        }                if (context.getProfiler().isEnabled())             context.getProfiler().end(this, "", result);                 return result;                  	}