In the example above, the NamedAnswerQuery role has been left unmapped so the answer query Web service cannot be used.
在上面的示例中，对NamedAnswerQuery角色没有进行映射，所以不能使用回答查询Web服务。
If database query and Web service invocation could occur in parallel, the asynchronous case would behave better.
如果数据库查询和Web服务调用并行进行，异步用例表现更加良好。
Web service provider and query.
Web服务提供商和查询。
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