OpenSAML user discussion

Hi,

I am using OpenSAML2 and java 1.5 to create the SAML assertion. But the TAG 
of the generated assertion is coming <saml:Assertion> I want to change the 
tag from saml to SAML2 so that in the assertion the tag will appear 
<saml2:Assertion>,<saml2:Issuer>  instead of <saml:Issuer>.

I am using the following code for creating assertion.
//Build the assertion
                 Assertion assertion = (Assertion) 
createSamlObject(Assertion.DEFAULT_ELEMENT_NAME); 
                 Namespace dsns = new 
Namespace("http://www.w3.org/2000/09/xmldsig#";, "ds"); 
                 assertion.addNamespace(dsns); 
                 Namespace xsins = new 
Namespace("http://www.w3.org/2001/XMLSchema-instance";, "xsi"); 
                 assertion.addNamespace(xsins); 
                 assertion.setVersion(SAMLVersion.VERSION_20); 

can someone please help me how can I change the assertion tag.

Thanks & Regards
Pritam