OpenSAML user discussion

Hi,
I have a problem in getting the designator from the AttributeQuery at the 
receiving end. In the sender i am putting the SAML request with 
AttributeQuery anp placing it in the SOAP body manually and calling a message 
based webservice to process it. At the web service end i am able to retrieve 
the SAML request and AttributeQuery. But when i invoke the getDesignators of 
the Attribute Query, I am getting an blank iterator object(no elements in the 
iterator). 

But i tried the same at the client side before invoking the web service, 
there i am getting the valu in the iterator. The attribute query at both 
client cide and server side are as follows

Client side
------------
<AttributeQuery>
   <Subject xmlns="urn:oasis:names:tc:SAML:1.0:assertion">
      <NameIdentifier>administrator</NameIdentifier>
  </Subject>
  <AttributeDesignator AttributeName="groups" 
AttributeNamespace="http://www.roche.com/pgl/soa/saml/attr/ns"/>
</AttributeQuery>

Server side
--------- 
<AttributeQuery xmlns="urn:oasis:names:tc:SAML:1.0:protocol" 
xmlns:saml="urn:oasis:names:tc:SAML:1.0:assertion" 
xmlns:samlp="urn:oasis:names:tc:SAML:1.0:protocol">
 <Subject xmlns="urn:oasis:names:tc:SAML:1.0:assertion">
   <NameIdentifier>administrator</NameIdentifier>
   </Subject>
   <samlp:AttributeDesignator AttributeName="groups" 
AttributeNamespace="http://www.roche.com/pgl/soa/saml/attr/ns";>
   </samlp:AttributeDesignator>
</AttributeQuery> 


Thanks in advance
Deepak