每个xml概要文件的开始部分是一个OPTPROFILE标记，其中包含元数据，比如表示所用COPS的版本的属性。
Each XML profile begins with an OPTPROFILE tag that contains metadata, such as an attribute indicating the version of the COPS being used.
您可以在测试文件上进行实践，去掉开始和结束标记，熟悉因此显示的错误消息。
You might wish to experiment with your test files, and move the end tags and beginning tags, to become familiar with the resulting error messages.
构造型和标记在 XMI 文件的一开始定义然后被引用，因此声明两个变量用于保存它们的 ID 非常方便。
The stereotypes and tags are defined in the beginning of the XMI file and later used by reference, so it is convenient to declare two variables to store their IDs.
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