Marking is a step or technique in MDA in which additional information, not within the semantic scope of the model itself, can be added to a model solely for use by automation later.
标记是 MDA 中的一个步骤或技术，在这个步骤当中，附加的信息（不包含在模型本身的语义范围中）能够被加入到模型中，在随后的自动过程中单独使用。
Marking a model, in OMG MDA terminology, means tagging a model with extra information that is used by tools, and that is not appropriate to be captured in the model's semantics.
在OMG mda术语中，标记一个模型意味着利用工具所使用的，不适合从模型的语义中得到的额外信息来标记一个模型。
It leaves the marking or unmarking to users’ consideration and asks users to confirm the deletion of model elements.
接着就会询问用户是否确认删除模型元素。
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