GMF有一组有序向导可以帮助您创建映射定义。
GMF has a neat set of wizards to help create a mapping definition.
这需要您先通过映射定义模型创建一个GMFGen模型。
To do this, create a GMFGen model from your mapping definition model.
根据映射定义，联合服务器将联合查询拆分为多个子操作。
According to the mapping definition, the federation server breaks down the federated query into multiple sub operations. Multiple factors influence this step.
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