Listing 1 shows how we specify the transaction context for an atomic request.
清单1展示了我们如何指定原子请求的事务上下文。
The dot (.) is now known as the context item expression, and might be a node or an atomic value, depending on the current item in the sequence being processed.
点号(.)在这里称为上下文项表达式，可以是节点或者原子值，视处理的序列中的当前项而定。
Future tutorials in the series will cover DB2 trusted context, Web service security, and Web service atomic transactions.
本系列的后续教程将介绍DB 2受信任上下文、Web服务安全和Web服务原子事务。
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