This helps to identify and locate a model object if you know the category or type of the object.
如果您知道对象的分类或类型，它可以帮助确定并定位模型对象。
This follows from our approach of a separate core model for each category; differences between application categories prevent us from basing all applications on a single core model.
这和我们采用的每种类别均有单一核心模型的方法是一致的；应用程序类别之间的差异使我们不能把所有应用程序都建立在单一核心模型上。
No matter what category developers are using, it is essential to build any DSL on top of a sound semantic model as the authors keep emphasizing.
无论开发人员使用哪一种类型的领域特定语言，作者在书中始终强调的关键是一定要在一种合理的语义模型基础之上打造领域特定语言。
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