[bdbxml] berkeley xml collection results problem

Hi to all,
i have some problem managing collection fro db.
I have put a document into xml db of such type:
"<rubrica><contact><nome>iose</nome><cognome>magno</cognome></contact><contact>
<nome>ciccio</nome><cognome>faga</cognome></contact></rubrica>"

then i try to query the document for elements.

  mgr = new XmlManager();
  XmlManagerConfig  mgrconfig= new XmlManagerConfig();
  XmlValue var = new XmlValue("iose");
  cont = mgr.openContainer("c://lavori//TestRicerca//miodatabase.dbxml");
  XmlQueryContext context = mgr.createQueryContext();
  context.setVariableValue("myVar", var); 
  String myQuery = "collection     
('c://lavori//TestRicerca//miodatabase.dbxml')/rubrica/contact/nome[.= 
$myVar]";
  context.setReturnType(XmlQueryContext.DeadValues);
// Prepare (compile) the query
   XmlQueryExpression qe = mgr.prepare(myQuery, context);
// Run the query.       
   results = qe.execute(context); 

When i run the code, I get this error:
com.sleepycat.dbxml.XmlException: Error: External access not allowed.  Cannot 
resolve
	collection: dbxml:c://lavori//TestRicerca//miodatabase.dbxml, errcode 
= XPATH_EVALUATION_ERROR
	at com.sleepycat.dbxml.dbxml_javaJNI.XmlQueryExpression_execute__SWIG_1
(Native Method)
	at com.sleepycat.dbxml.XmlQueryExpression.execute
(XmlQueryExpression.java:93)
	at TestRicerca.main(TestRicerca.java:71)


I get this error also if i run (copy and paste) the code provided in the 
berkeley tutoial section about querying using "collection". What's wrong? i 
have no problem using other db functionalities like retrive document, update, 
insert with XmlModify etc... Whay i get this error using collection?




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