Embedded XQuery Expression in BPEL 2.0

Question

The Oracle SOA Suite docs seem to indicate that embedded XQuery expressions can be used in a BPEL 2.0 component.
The docs here, that is: http://docs.oracle.com/cd/E21764_01/integration.1111/e10224/bp_manipdoc.htm#BABBHIEG
However, I can't seem to make this obscurely referenced piece of functionality work.
Has anybody used this before? If in-line XQuery is truly available, it would be very handy.
Edited by: user8641584 on May 24, 2012 8:02 PM
Added some tags

Answer 1

I read the blog post here
Embedding Java in BPEL process
Based on that I created this test class to help write code:
The bolded code is the snippet I actually want to implement when I can solve the problem above.
package com.f17.customfunction;
import com.collaxa.cube.engine.ext.bpel.v1.nodes.BPELXExecLet;
public class codeTyper extends BPELXExecLet {
    public codeTyper() {
        super();
    public void exec(){
     // below code gets pasted in here
String input = (String)getVariableData("testfile");
oracle.soa.common.util.Base64Decoder Decoder = new oracle.soa.common.util.Base64Decoder(); 
try { 
byte[] decodedByteArray = oracle.soa.common.util.Base64Decoder.decode(input.getBytes());
setVariableData("compANDstore_merge_InputVariable.AusCreditCollection/ns2:AusCredit/ns2:fileData,decodedByteArray",decodedByteArray);
} catch(Exception e) {
e.printStackTrace();