/**
* @return string the error message in XML format
*/
public function serialize()
{
$rs = "<methodResponse>\n";
if ($this->faultCode) {
$rs .= "<fault>\n <value>\n <struct>\n <member>\n <name>faultCode</name>\n <value><int>" . $this->faultCode . "</int></value>\n </member>\n <member>\n <name>faultString</name>\n <value><string>" . $this->faultString . "</string></value>\n </member>\n </struct>\n </value>\n</fault>";
} else {
$rs .= "<params>\n<param>\n" . $this->value->serialize() . "</param>\n</params>";
}
$rs .= "\n</methodResponse>";
return $rs;
}