'Maps trigger to hook and operation assignments from trigger.module.', 'fields' => array( 'hook' => array( 'type' => 'varchar', 'length' => 32, 'not null' => TRUE, 'default' => '', 'description' => 'Primary Key: The name of the internal Drupal hook upon which an action is firing; for example, nodeapi.', ), 'op' => array( 'type' => 'varchar', 'length' => 32, 'not null' => TRUE, 'default' => '', 'description' => 'Primary Key: The specific operation of the hook upon which an action is firing: for example, presave.', ), 'aid' => array( 'type' => 'varchar', 'length' => 255, 'not null' => TRUE, 'default' => '', 'description' => "Primary Key: Action's {actions}.aid.", ), 'weight' => array( 'type' => 'int', 'not null' => TRUE, 'default' => 0, 'description' => 'The weight of the trigger assignment in relation to other triggers.', ), ), 'primary key' => array('hook', 'op', 'aid'), ); return $schema; }