In PL／1, information associated with the invocation of a block that is used in the interpretation of references, within the invoked block, to data declared outside the block. This information includes generations of automatic variables, extents of defined variables, and generations of parameters.; 在PL／1語言中,當在活動的程序塊內部引用在程序塊外部說明的數據時,用于解釋這種引 用的有關程序塊調用的信息。在這種信息中包括自動變量的產生、已定義變量的范圍及參數 的產生。