例子：定义映射领域模块。

Example: Defining the map domain module.

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基于各种登录模块实现(使用数字证书，或由用户实现的登录模块实现)的安全领域超出了本文的范围。

Security realms based on login module implementations that either use digital certificates or are user implemented are beyond the scope of this article.

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创建外壳DTD组装基本的映射模块、领域实体文件和定义模块。

Create a shell DTD that assembles the base map module and the domain entities file and definition module.

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