每个系统都有其专有的语义，但是被映射到一个逻辑数据模型，可以将此模型实例化为一个物理联合模型或规范消息模型。

Each system has its own proprietary semantic meaning, but is mapped to a logical data model which can be instantiated as a physical federated model or a canonical message model.

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默认的映射清单不包括局部元素，因此，供应链emf模型不能转换描述局部元素实例的xml片段。

The default list of mappings excludes local elements, and therefore, the supply-chain EMF model can't convert an XML fragment that represents an instance of a local element.

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在映射阶段，引擎评估关联，并通过在相关模型实例中进行迭代产生映射。

During the mapping stage, it evaluates the relations and generates mappings by iterating through the relevant model instances.

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