NS_NOTYETIMPLEMENTED("write me!"); return NS_ERROR_NOT_IMPLEMENTED;
NS_PRECONDITION(aHasChildNodes != nsnull, "null ptr"); if (! aHasChildNodes) return NS_ERROR_NULL_POINTER;  if (mRootContent) { *aHasChildNodes = PR_TRUE; } else { *aHasChildNodes = PR_FALSE; } return NS_OK;
XULDocumentImpl::HasChildNodes(PRBool* aHasChildNodes){    NS_NOTYETIMPLEMENTED("write me!");    return NS_ERROR_NOT_IMPLEMENTED;}