rv = CreateTemplateAndContainerContents(aElement, nsnull );
rv = CreateTemplateAndContainerContents(aElement, nsnull , nsnull );
RDFGenericBuilderImpl::CreateContents(nsIContent* aElement){    NS_PRECONDITION(aElement != nsnull, "null ptr");    if (! aElement)        return NS_ERROR_NULL_POINTER;    // First, make sure that the element is in the right widget -- ours.    nsresult rv = NS_OK;    if (IsElementInWidget(aElement)) {        rv = CreateTemplateAndContainerContents(aElement, nsnull /* don't care */);    }    return rv;}