为了解决这一问题，Microsoft建立了一个外部服务描述文档的相关性，它描述了数据类型，且能被服务提供者和请求者访问。

To solve this problem, Microsoft built a dependency on an external service description document, that described the data types and could be accessed by both the requester and provider.

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这是由于对先前描述的外部模式的限制所引起的，它阻止工具使用总线自动创建的 WSDL 描述入站服务。

This is due to the limitation regarding external schema described earlier, which prevents tool usage of the WSDL created automatically by the bus to describe the inbound service.

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生成这种外部封装器的步骤同步骤3中描述的用于内部服务的步骤类似。

The steps to generate such external wrappers are similar to those described in step 3 for the internal services.

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