实数: real number据: occupy; seize项: nape数据项: data items; datum; di data item变址数据项: index data item布尔数据项: boolean data item导出数据项: derived data item发送数据项: sending data item浮点数据项: floating point data item基本数据项: elementary data item接收数据项: receiving data item结构数据项: structure data item; structured data item结果数据项: result data item控制数据项: control data item; controldataitem领域数据项: realm data item逻辑数据项: logical data item模式数据项: schema data item全局数据项: global item全字数据项: full-word data item冗余数据项: redundant data item; redundant item实源数据项: actual source data item数据项表: data item table数据项级: data item level数据项类型: data item type数据项描述: did data item description
