Business system users update and query master data typically through the use of their respective business systems.
通常情况下，业务系统用户通过各自的业务系统更新和查询主数据。
2
In a relational language, such a query would require a join that might span several data tables and system catalog tables.
而在关系语言中，这种查询需要进行也许跨越了多个数据表和系统目录表的联接。
3
It is available for query through the EPCIS query control interface, but the means by which master data enters the system is not specified in the current EPCIS 1.0 standard.