Jdl is an interpretative language system . it has data types , expression , control flow statements and user - defined function just like the imperative programming language , but also has data types and statements such as job control statements , task control statements , wait statement , parallel statement and monitor statements particular to jms Jdl是一種解釋型語言系統,既有一般命令式語言所具有的數據類型、表達式、控制流語句和用戶自定義函數等要素,也另有作業管理系統所特有的數據類型、作業控制語句、任務控制語句、等待語句、并行語句和監聽語句等。