It is a first class entity in the meta-model of SimpleRDB, but it has no equivalent in UML 2.0. That is why the signature of the relation has no formal parameter that relates a UML element.
它是SimpleRDB的通用模型的第一个类实体，但是在UML 2.0中没有它的对等体。这就是关联的签名没有与uml元素相关的形式参数的原因。
The entity model of components of software development risk is created with the means of entity relation.
采用实体联系模型方法建立了软件开发过程风险各部件的实体模型；
Further more, rules of case library designing, organizing and distributed storing are investigated, in which, an E-R (Entity-relation) model of plastic parts and injection mould is constructed.
进一步提出了实例库的设计原则与组织原则，建立了塑件和模具之间的E -R模型，提出了注射模实例的分散组织存储方法。
Further more, rules of case library designing, organizing and distributed storing are investigated, in which, an E-R (Entity-relation) model of plastic parts and injection mould is constructed.
进一步提出了实例库的设计原则与组织原则，建立了塑件和模具之间的E -R模型，提出了注射模实例的分散组织存储方法。
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