• 1. Extension use case: 扩展用例

• 1.If the new use case truly is a superset or extension of the old use case, this process results in a sound and reliable new best practice.
  如果新用例真的是旧用例的超集或扩展，那么此过程将产生合理和可靠的新最佳实践。
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• 2.The first SOA use case is an extension of the scenarios described in the traditional context above.
  第一个SOA用例是前面在传统上下文中描述的场景的扩展。
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• 3.Enter the document type name Use Case Model, the extension UCM, and the outline name, as shown in Figure 37.
  输入文档类型名称use Case Model、扩展名ucm，以及大纲名称，如图37所示。
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