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。
The purpose of the semantic description of the service is to help the service requester to understand the content, scope, requirements, outcomes and effects before the service is invoked.
服务的语义描述的用途在于，可帮助服务请求程序在调用服务前理解服务的内容、范围、要求、输出和效果。
The basic semantic tries to find an existing object using id and scope.
基本语义尝试使用id和scope找到现有对象。
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