Unobserved / hidden states 不可观察/隐藏状态 Add relational structure 增加相关结构 E.g., use information from the products table, rather than only product ID 如产品表而非仅仅产品标识 .
The structureofknowledgebase is build by the database of relational data model. In order to addrulesand delete reduplicate rules, knowledgebasehas the function of addition, deletion and so on.