数据操作服务(在下方的层中)从物理存储库中提取数据，并且语义服务将该数据转换为信息。
The data manipulation services (in the lower layer) extract data from the physical repositories, and semantic services turn this data into information.
一旦建立了数据源，就可以操作它而不用关心连接的语义了。
Once you have a data source, though, you can operate on it without regard to the connection semantics.
在我们的示例中，对客户信息进行操作的COBOL事务对相同的数据集进行操作，因此是语义相关的。
In our example, COBOL transactions that operate on customer information are semantically related in that they operate on the same set of data.
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