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。

youdao

RUP's entity classes are roughly equivalent to the business-level analysis classes above.

RUP过程中的实体类大致上相当于前面提到的，业务级别的分析类。

youdao

Note that the second execution of the compiled LINQ query is equivalent to the second execution of the Entity SQL query.

注意，编译的LINQ查询的第二次执行与Entity SQL查询的第二次执行相等。

youdao

Thus, Arizona courts have interpreted the gift clause to mean that if the state or one of its municipal governments gives money to a private business entity, the public must get something back of equivalent value.

FORBES: Constitutional Protection Against the Corporate State