}
protected SignedParts getEmptySignedParts(Iterator itr){
while(itr.hasNext()){
Target target = (Target)itr.next();
SecurityPolicyVersion spVersion = SecurityPolicyUtil.getSPVersion((PolicyAssertion)target);
if(PolicyUtil.isSignedParts((PolicyAssertion)target, spVersion)){
if(SecurityPolicyUtil.isSignedPartsEmpty((SignedParts) target)){
return (SignedParts) target;
}