实体实例 meaning in English

entity instance

Contains references to the attributes used to identify an instance of the entity to the user
包含对用来为用户标识实体实例的属性的引用。
The mapping rule from express data schema to relational databases schema is studied . the translation of the different semantic data types of express into the data definition language of sql is discussed . the persistency of step data in relational databases is realized based on an entity instance manager in working form
论文对express信息模型到关系数据库模型的映射规则进行了研究，详细分析了express语言的不同数据类型到sql数据类型的转化方法，并对内存实现方式的产品数据仓库的结构、功能进行了研究，阐述了基于关系数据库的实体实例索引表的建立方法。