ValidatorTest_Person.php

<?php
class ValidatorTest_Person extends Doctrine_Entity {
   public static function initMetadata($class) {
      $class->setColumn('identifier', 'integer', 4,
            array('validators' => array('notblank', 'unique')));
      $class->setColumn('is_football_player', 'boolean');
      $class->hasOne('ValidatorTest_FootballPlayer',
            array('local' => 'id', 'foreign' => 'person_id'));
   }
}