Second, it makes the relations and their semantics explicit, whereas in a standard database schema many relations are implicit in design of the schema.
其次，它使关系和它们的语义变成显式的，而在标准的数据库模式中许多关系隐含在模式的设计中。
2
This is due to the semantics specified in the standard; it's not unique to DB2.
这是由于标准中规定的语义造成的，而且这并不是DB 2所特有的。
3
BPEL 1.0, another standard, defined the execution semantics of a workflow process in a runtime.