conceptual schema造句

• Physical data independence : the capacity to change the internal schema without having to change the conceptual schema
  逻辑资料独立：不必改变外部纲要或应用程式，即可改变概念纲要的能力。
• Irds conceptual schema , part 1 : conceptual schema for irds , part 2 : modeling language analysis not an american national standard
  Irds概念模式,第一部分: irds概念模式,第二部分:模型语言分析
• Then user browses the web pages , selects interested web page as sample page and create conceptual schema based on the understanding of content of the sample page . thirdly , the user marks the interested information blocks in sample page and build up the correspondence between the interested information blocks of sample page and fields of conceptual schema , and at the meanwhile system passes the correspondence to learning module to form extraction rules and stores them into rule database . fourthly , extraction module extracts information from the similar - structured pages by using the extraction ailes and sends the extracted results to classified cache database for users " further query
  该系统首先将web信息按模式和风格划分为不同领域，建立领域知识库，以便对用户的查询进行导航并缩小查询范围；然后利用现有的搜索引擎实现关键词查询，利用浏览功能寻找感兴趣的网页，对找到的网页根据其内容建立自定义的用户概念模式；利用概念模式对网页进行标记，使概念模式中的字段与网页中的信息块对应起来，建立对应关系并传给学习模块以形成抽取规则并存入规则库；抽取模块根据规则库中的抽取规则进行信息抽取并将抽取到的信息按用户定义的概念模式形成记录，按领域分类存储于cache库中以备用户查询；最后，用户利用查询功能实现个性化查询。