1）通用实体与参数实体 实体可以分为通用实体(general-entity)与参数实体(parameter-entity)： 实体声明：[70] EntityDecl ::= GEDecl | PEDecl 其中： 通用实体声明：[71] GEDecl ::= '' 参数实体声明：[72] PEDecl ::= '...
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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。
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.
与命名实体一样，参数实体在整个文档被读取之后才被扩展。
Like named entities, they're not expanded until the entire document has been read.
在此基础之上，对基于3维草图的实体生成及其在3维造型系统中的管理方式与参数化进行了研究。
Furthermore, 3d - Sketch based solid creating, the management of 3d - Sketch in 3d - Modeling system and the parameterization of 3d - Sketch were discussed in this paper.
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