清单10还说明如何编写查询才能保持跨模式的能力。

Listing 10 also gives a hint of how not to write queries when the goal is to preserve their ability to work on different schemas.

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数据服务允许跨模式重用数据类型和跨服务操作重用模式。

Data services allow reuse of data types across schemas and reuse of schemas across service operations.

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这一节讨论控制模式演化的实际问题，并提供出一组用于编写跨模式版本查询的指导原则。

In this section, we'll discuss practical issues involved in controlling schema evolution and present a compact set of guidelines for writing queries across schema versions.

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