element->mDocument    = mPrototype;
XULContentSinkImpl::CreateElement(nsINodeInfo *aNodeInfo,                                  nsXULPrototypeElement** aResult){    nsXULPrototypeElement* element = new nsXULPrototypeElement(/* line number */ -1);    if (! element)        return NS_ERROR_OUT_OF_MEMORY;    element->mNodeInfo    = aNodeInfo;    element->mDocument    = mPrototype;    *aResult = element;    return NS_OK;}