[Exist-open] eXist & XQuery

[.::: M. :::. <mp...@cc...>]

Hi,


I Am trying to pass an XML document to an XQuery expression as an external 
variable using the following Java code:
--------- 8< ----------
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db         = dbf.newDocumentBuilder();
org.w3c.dom.Document d     = db.parse( xmlDocumentAsInputStream );
// Uses the following driver class 'org.exist.xmldb.DatabaseImpl'
xqueryService.declareVariable( "xmlDocumentVariableName", d );
----------- 8< --------


And XQuery expression:
------------ 8< -------
xquery version "1.0" encoding "UTF-8";


(: Declare external variables :)
declare variable $xmlDocumentVariableName as node() external;

(: Return the result :)
for $myResult in $xmlDocumentVariableName
 	return $myResult
--------------- 8< ------------


The code execution fails and I will get the following error message:
-------------- 8< -------------
Caused by: MyException: XML:DB Exception (error code: 1).
...
Caused by: org.xmldb.api.base.XMLDBException: unsupported Java type: class 
org.apache.xerces.dom.DeferredDocumentImpl
 	at 
org.exist.xmldb.RemoteXPathQueryService.query(RemoteXPathQueryService.java:111)
 	at 
org.exist.xmldb.RemoteXPathQueryService.query(RemoteXPathQueryService.java:70)
 	at 
org.exist.xmldb.RemoteXPathQueryService.execute(RemoteXPathQueryService.java:404)
...
Caused by: java.io.IOException: unsupported Java type: class 
org.apache.xerces.dom.DeferredDocumentImpl
 	at 
org.apache.xmlrpc.XmlRpcClient$Worker.execute(XmlRpcClient.java:444)
 	at org.apache.xmlrpc.XmlRpcClient.execute(XmlRpcClient.java:163)
 	at 
org.exist.xmldb.RemoteXPathQueryService.query(RemoteXPathQueryService.java:98)
 	... 28 more
----------------------- 8< ------------------


Am I doing something wrong here? How should I pass an XML document to an 
XQuery expression as an external variable? I know that I could pass the 
XML document as a string (xs:string in XQuery expression) and then use 
eXist's util:parse() function but I would like to keep my XQuery 
expressions "clean" i.e. without implementation specific code.

I am using eXist-db 1.2.4-rev:8072-20080802

Kind regards


-Markku Laine