DOMBuilder builder = new DOMBuilder();
builder.startDocument();
builder.startElement(NS, "set", "set", EMPTY_ATTRS);
execute(builder, jexlContext, jxpathContext, macroCall,
startSet.next, startSet.endInstruction);
builder.endElement(NS, "set", "set");
builder.endDocument();
Node node = builder.getDocument().getDocumentElement();
NodeList nodeList = node.getChildNodes();
int len = nodeList.getLength();
// JXPath doesn't handle NodeList, so convert