* The value is, e.g. employeeNumber <br>
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getLdapAttrEmployeeNumber();

    /**
     * Get the value for the key 'ldap.attr.mail'. <br>
     * The value is, e.g. mail <br>
     * @return The value of found property. (NotNull: if not found, exception but basically no way)