为了决定添加什么关键字，从转换内容中访问资源对象，并将其传递给一个uml类。
To determine what keyword to add, access the source object from the transformation context and cast it to a UML Class.
当需要访问单个类型的所有对象的某些全局数据时，请考虑使用此关键字。
Think of it anytime you require access to some global data for all objects of a single type.
向UM l类输入源对象，然后从中获得关键字列表。
Type the source object to a UML class, and then get the keyword list from it.
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