【作者】 周武；

【导师】 金远平；

【作者基本信息】 东南大学 ， 计算机应用， 2004， 硕士

【摘要】 语义映射是数据交换,信息集成的重要基础。随着XML已成为WEB上数据表示和交换的事实标准,人们已研究出将关系数据库中的数据自动转换为缺省XML数据的有效方法,可以认为这些数据库中的数据具有XML形式,这也意味着目前网络上多样化的数据可以用XML数据模型统一描述,XML数据的语义映射成为新的研究热点。本文在定义语义映射概念基础上,从基于结构和基于本体两个方面,介绍了XML数据语义映射,提出一种混合的映射方法。针对XML语义,首先介绍了语义网的相关概念,并针对语义网模型中定义语义的RDFS层和本体层进行研究。在介绍RDF和RDFS的基本特性和一般形式的基础上,重点研究使用OWL构建XML本体信息的方法,并分析这些方法各自的特点和优势,将RDFS和OWL进行比较,阐明了他们之间的相互关系。同时,鉴于XML本身语义表达上的不足,以及本体构建对语义信息的需求,本文提出了一种从XML文档中以标准RDFS三元组的形式半自动抽取本体信息的方法。在研究了基于结构,以及基于本体信息的XML语义映射方法之后,本文采用RDFS作为本体的描述语言研究了MAFRA本体映射系统,该系统集成了大量的本体映射技术。同时,也针对W3推荐的本体描述语言OWL介绍了相关的映射机制。最后,本文提出了结合XML语义映射以及相关技术解决异构数据集成的系统框架和思想,阐述了相关的结构和原理。有关语义网络的研究正处于不断发展中,希望本文的研究对语义网络的发展具有促进作用。更多还原

【Abstract】 Semantic mapping is a fundamental problem for information integration. As XML has been the de facto standard of data representation and exchange in the Web and people have also found efficient ways to convert relation data to XML, XML data semantic mapping becomes a research hotspot.In this paper, we first define what is semantic mapping. On the basis of describing how to do the mapping in the structural facet and discussing the possibility of using the ontology technology to map between XML data sources, we propose a hybrid approach to XML data semantic mapping. On considering of XML semantic, we introducte the concept of Semantic Web and concentrates the research on the RDFS layer and Ontology layer of the Semantic Web model. Through reviewing of the basic attributes and formal formats of RDF and RDFS, we describe the methods for the construction of XML ontology by using OWL and analyze the characteristic and superiority of each method. After this, the paper makes a comparison of RDFS and OWL in detail to illustrate the relationship between them. In considering of the limitation of semantic expression ability of XML and the need of semantic information in ontology construction, this paper proposes an approach to extracting standard RDFS Notation3 semi-automatically from XML documents.this paper also introduces a mapping framework called MAFRA and relevant mechanisms in OWL.Finally, a realistic information integration system based on XML Semantic Mapping and related technology is proposed.We believe that the research of this paper is significant to the development of Semantic Web.更多还原