OpenSAML user discussion

["sanchit misra" <>]

Hi I am using opensaml 2 in my project. 
I followed the following steps: 
1. created a new AuthzDecisionStatement 
2. marshalled it and 
3. used the output DOMElement * of marshall to create a new AuthzDecisionStatement using unmarshalling

and it works!!

But then I tried to use a file containing an AuthzDecisionStatement xml. I created a DOMDocument using that file and passed the DOMNode to the unmarshall

This is how my code looks like:
----------------------------------------------------------------------------------------------------------------------------------------------------
           // the below two lines are only to check whether the DOMNode element is correct
            XMLHelper::serialize(currentNode, cout);
            cout << endl;

            DOMElement *currentElement = dynamic_cast<DOMElement*>(currentNode);
            if(currentElement==NULL)
                cout << "unmarshall: currentElement = NULL\n";

            const XMLObjectBuilder* builder = XMLObjectBuilder::getBuilder( currentElement ) ;
            cout << "unmarshall: node = " << currentNode->getNodeName() << endl;  
            XMLObject* xo = builder->buildFromElement( currentElement ) ;

            AuthzDecisionStatement *statement = dynamic_cast<AuthzDecisionStatement*>(xo);
             
            if(statement==NULL)
                cout << "unmarshall: statement is NULL\n";
----------------------------------------------------------------------------------------------------------------------------------------------------

I am getting the following output:
<saml:AuthzDecisionStatement Decision="permit" Resource="resource" xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion"/>
unmarshall: node = saml:AuthzDecisionStatement
unmarshall: statement is NULL

which means currentElement is not NULL, but statement is. I also checked if xo is NULL, but it isn't which means its a case of dynamic_cast failing. Which means builder doesn't return a proper AuthzDecisionStatement.
I don't how to find which builder was invoked.
Also looking at the xml, I can't think of any reason of not working. I hope it's not because the xmlns:saml attribute is last instead of being first in the list.