要决定添加哪个标签，在转换环境中访问源对象，并将其转换为 UML 类。

To determine which tag to add, access the source object from the transformation context and cast it to a UML class.

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这时产品对象已经被转换成为了正确的类，所以您不需要自己再次的转换它。

This was already cast as the correct class of product object, so you do not need to cast it yourself.

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转换类型可分为三类：方法调用转换、字段访问转换和新对象转换。

These fall into three categories: method call transformations, field access transformations, and a new object transformation.

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