public function analyze()
{
$literals = array('String', 'Integer', 'Real', 'Boolean', 'Null', 'Identifier', 'Nsname');
$this->atomIs('Comparison')->codeIs(array('==', '==='))->outIs('RIGHT')->atomIs($literals)->inIs('RIGHT')->outIs('LEFT')->atomIsNot($literals)->back('first');
$this->prepareQuery();
}