return NS_OK;
nsresult rv;  rv = aVariables.Add(mContentVariable); if (NS_FAILED(rv)) return rv;  rv = aVariables.Add(mIdVariable); if (NS_FAILED(rv)) return rv;  return TestNode::GetAncestorVariables(aVariables);
ContentTagTestNode::GetAncestorVariables(VariableSet& aVariables) const{    return NS_OK;}