Saxon

Legacy ID: #4421664 Legacy Poster: Bertrand Mirat (bemi)

Hi, using saxon8-dom.jar and saxon8.8, I stumbled on something that I think may be a bug. What I have is, 1) a method in some class that returns an Element created using JAXP DocumentBuilderFactory mechanism (this ends up for me in Xerces' DOM implementation) : public class ElementCreator { /* This method returns an org.apache.xerces.dom.ElementImpl */ public static newElement () throws DOMException, ParserConfigurationException { return DocumentBuilderFactory.newInstance() .newDocumentBuilder().newDocument() .createElement("e"); } } 2) this method will be used from within an XQuery using a 'test' prefix : // [...] basic initialization code staticContext.declarePassiveNamespace("test", "java:ElementCreator", false); 3) call the java method from a Saxon XQuery using the 'test' prefix : xquery = staticContext.compileQuery ("test:newElement"); ...I would expect a result list with one item when evaluating : xquery.evaluate(); ..but what I get is an empty list. But note, if I add a child Node -say, a Text- to the Element before returning it, the XQuery evaluation result is as expected : a list with one element. I tracked this unexpected behaviour down to the method : DOMEnvelope.convertObjectToXPathValue(Object object) { if (object instanceof NodeList) { // [...] loop over the Nodes from the NodeList, // [...] returning null if one is not an instance of NodeOverNodeInfo return new SequenceExtent(nodes); } ...and I found that, Xerces' ElementImpl being also a NodeList, if it has no child, we end up returning the SequenceExtent with no node inside => empty result list. But if the ElementImpl has a child, this method returns null because the Element's child is not a NodeOverNodeInfo ; and the Element is then later wrapped into a NodeWrapper by DOMObjectModel (this happens at the end of Value.convertToBestFit) => one result list as expected. Is this a bug? Shouldn't the first line of DOMEnvelope.convertObjectToXPathValue(Object object) be more similar to the first line of DOMObjectModel.convertObjectToXPathValue(Object object) , that is, if (object instanceof NodeList && !(object instanceof Node)) { ..?