    *  Doctrine::ATTR_LISTENER
    *  Doctrine::ATTR_FETCHMODE        = 2;

    *  Doctrine::ATTR_CACHE_DIR        = 3;

    *  Doctrine::ATTR_CACHE_TTL        = 4;

    *  Doctrine::ATTR_CACHE_SIZE       = 5;

    *  Doctrine::ATTR_CACHE_SLAM       = 6;

    *  Doctrine::ATTR_CACHE            = 7;

    *  Doctrine::ATTR_BATCH_SIZE       = 8;

    *  Doctrine::ATTR_PK_COLUMNS       = 9;
    /**
     * primary key type attribute
     */
    *  Doctrine::ATTR_PK_TYPE          = 10;
    /**
     * locking attribute
     */
    *  Doctrine::ATTR_LOCKMODE         = 11;
    /**
     * validatate attribute
     */
    *  Doctrine::ATTR_VLD              = 12;
    /**
     * name prefix attribute
     */
    *  Doctrine::ATTR_NAME_PREFIX      = 13;
    /**
     * create tables attribute
     */
    *  Doctrine::ATTR_CREATE_TABLES    = 14;
    /**
     * collection key attribute
     */
    *  Doctrine::ATTR_COLL_KEY         = 15;
    /** 
     * collection limit attribute
     */
    *  Doctrine::ATTR_COLL_LIMIT       = 16;
