CAJ | 학술논문

为了表示元组和属性值的逻辑区别,引入了一个双层描述逻辑,其中概念分为两类:元组概念和属性值概念.给出双层描述逻辑的语言、语法和语义;然后定义从数据库中的关系到双层描述逻辑的知识库以及双层描述逻辑的模型的转换;最后扩展双层描述逻辑,使得其中的角色分为3类:元组之间的角色、元组与属性值之间的角色以及属性值之间的角色.
위료표시원조화속성치적라집구별,인입료일개쌍층묘술라집,기중개념분위량류:원조개념화속성치개념.급출쌍층묘술라집적어언、어법화어의;연후정의종수거고중적관계도쌍층묘술라집적지식고이급쌍층묘술라집적모형적전환;최후확전쌍층묘술라집,사득기중적각색분위3류:원조지간적각색、원조여속성치지간적각색이급속성치지간적각색.
To represent the logical difference of tuples and attribute values,a dual description logic for databases was introduced,in which concepts are classified into two classes:tuple concepts and attribute-value concepts.The logical language,syntax and semantics of the dual description logic for databases were introduced;two transformations from the relations in databases into knowledge bases or models in DDLD were defined;and finally an extended dual description logic for databases was introduced,in which roles are classified into three classes:the roles between tuples,the roles between tuples and attribute values and the roles between attribute values.