Making study of data model , first we investigate xml data model and semi - structure data model . and to research the semi - structure characteristics of xml : self - describe , graph - based model and irregular . then the analysis of normal tree - structure model is presented 在对数据模型的研究中,首先介绍了xml数据模型和半结构化的数据模型,研究了xml的半结构化特征:自描述、图结构和不规则,并分析了xml常见的树结构模型。
( 2 ) a new data model called xcdm is presented based on two semi - structured data model oem and oim . in web information integration system , it ' s a general method to provide an efficient common data model ( cdm ) in order to integrate multi - data source with different data model Xcdm可以起到某种元数据的作用,统一描述半结构和无结构数据,它符合公共数据模型的几点准则,完全适合作为web信息集成系统中的公共数据模型。
It had already been used in the fields , such as enterprise , military , economy , environment , medical science , energy , traffic - public and safe , etc . practice has proved dss is the effective way to solve problem with multi - goal , multi - level and semi - structure already 目前已广泛应用到企业、军事、经济、环境、医学、能源、交通和公共安全等领域。实践证明dss已经成为解决半结构化的多层次、多决策者和多目标决策问题的有力工具。
Nsf - europe workshop : " nips 2001 workshop on machine learning methods for text and images . " the aim of the workshop is to present new perspectives and new directions in information extraction from structured and semi - structured data for machine learning 国家科学基金会欧洲研讨会:生理科学新闻报, 2001年文字与影像的机器学习方法之研讨会.研讨会的目标,是从机器学习结构化与半结构化资料所萃取出来的资讯中,发表当中的新看法与新方向。
Based on the points , this thesis studied wi as a whole , and obtained the following results : ( 1 ) ontology - guided techniques and architecture of wi system ; ( 2 ) deductive object model with semi - structured features ( domsf ) as the unified data model for wi system 在此基础上对wi进行全面的研究,获得以下研究成果: ( 1 )以本体模型( ontology )为指导的wi系统方法和结构。 ( 2 )演绎的带有半结构化特征的对象数据模型domsf ,作为wi系统的统一数据模型。