decis execut committe decemb implement joint action uniform format resid permit sch rev execut committe regard articl convent implement schengen agreement sign schengen june hereinaft quot schengen convent quot regard articl abovement convent regard decis central group recal outcom central group meet octob decid schengen state endeavour implement joint action decemb uniform format resid permit jha joint action oj phase end transit period stipul joint action vienna decemb presid schlögl