为了实现地理模型的自动包装，本文提出了可扩展的模型定义文档框架。

For automatic wrapping models, the paper provides extensible model definition document framework.

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针对新数据类型的数据模型扩展性，支持系统和用户所定义的元数据。

Data model extensibility for new data types, and support for system and user defined metadata.

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为了实现该汽车贷款流程，我们将扩展业务服务模型中定义的基于内容的断言，并构建以下两个新的断言。

To implement the auto loan process, we'll extend the content-based assertions defined in the Business Service Model, and build the following two new assertions.

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