data descriptor (DD,DDESC)
Characters used to describe data. A descriptor is concerned with many aspects of storage. These aspects are indicated by various bits in the descriptor.; 用于描述數(shù)據(jù)的若干字符。一個(gè)描述符涉及存儲的許多方面,它們分別由描述符中的有 關(guān)數(shù)位指出。