A data model named DTO(Data and Tool Object) is offered to characterize a design object which is identified by four aspects: ObjectClass-id, Method, Versionand Facet.
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- 它采用一个数据模型(称为DTO模型)刻划设计对象,由四个基本参量(设计对象类,设计方法,历史版本,等价视图)唯一确定。