private function getItemNodeName()
    {
        $mappings = array(
            'ListMetadataFormats' => 'metadataFormat',
            'ListSets'            => 'set',
            'ListIdentifiers'     => 'header',
            'ListRecords'         => 'record'
        );

        return (isset($mappings[$this->verb])) ? $mappings[$this->verb] : false;
    }