为此，文中用面向对象的知识表示方法描述并建立本体，并以此为基础形成领域操作代数系统和智能体服务描述语言。
The paper describes and develops ontology by object-oriented knowledge representation, hence the representation leads to domain algebra system and agent service description language.
这些语言有些是代数结构的，有些是基于演算的，还有的是面向逻辑程序设计的。
Some of such query languages are based on algebra, some are based on calculations, others are based on logic programming.
应用推荐