/**
     * holds an array of fieldnames
     *
     * first dimension keys are the type constants
     * e.g. self::$fieldNames[self::TYPE_PHPNAME][0] = 'Id'
     */
    protected static $fieldNames = array (
        self::TYPE_PHPNAME       => array(),
        self::TYPE_CAMELNAME     => array(),
        self::TYPE_COLNAME       => array(),
        self::TYPE_FIELDNAME     => array(),
        self::TYPE_NUM           => array()
    );

    /**
     * holds an array of keys for quick access to the fieldnames array
     *
     * first dimension keys are the type constants
     * e.g. self::$fieldKeys[self::TYPE_PHPNAME]['Id'] = 0
     */
    protected static $fieldKeys = array (
        self::TYPE_PHPNAME       => array(),
        self::TYPE_CAMELNAME     => array(),
        self::TYPE_COLNAME       => array(),
        self::TYPE_FIELDNAME     => array(),
        self::TYPE_NUM           => array()
    );