Returning an XmlDocument from an external function?

Question

Hi,
In an attempt to simplify my XQueries, I have started looking at writing some of the more complex functions in Java and calling them via an XmlExternalFunction.
This seems fine, except that I have an issue with returning a constructed document (or any node set). The only way I have found to return a document without it being destroyed is to put it into a temporary database first. Here is the end of my function. I have written a convenience function that converts a DOM Xml Document into a dbxml XmlDocument (DomToXmlDbDoc).
     XmlResults results = mgr.createResults();
     XmlDocument result = DomToXmlDbDoc(doc);
     XmlContainer tmp = mgr.openContainer(txn, "_tmp.dbxml");
     result.setName(UUID.randomUUID().toString());
     putDocument(tmp, result);
     tmp.close();
     XmlValue value = new XmlValue(result);
     results.add(value);
     return results;
I would prefer not to have to use the temporary storage in the middle as it is inefficient and rather untidy, but the following just gives a blank result.
     XmlResults results = mgr.createResults();
     XmlDocument result = DomToXmlDbDoc(doc);
     XmlValue value = new XmlValue(result);
     results.add(value);
     return results;
Best Regards
Pete.

Answer 1

Hi,
this is a bug in DB XML, namely in Java bindings. I could try to search a patch for this (which is not very well tested though) and send you by email if you tell me your address.
Vyacheslav