Research on PDF Documents Information Extraction System Based on XML

摘要

With the development of Internet, Web has become the biggest resource warehouse. Facing the more and more abundant digital information resources, the traditional way for information management cannot catch up with the development of modern society. So a kind of systematic technology is needed urgently to manage the digital information resources. To meet with this kind of need the digital library came into being. The digital library is a new developing and promising application, among which Information Integration is a basic component. The digital library's information systems adopt the specific resource forms, For example, the resource form of Wangfan is pdf and that of CNKI is caj. So it is unconveniencing that users have to install specific reader before reading these resources. The work we are doing is to develop a new digital library, from which the users can read the resources directly and it is not necessary for the users to read them by the specific reader. From the point of literature management, it is necessary for us to decompose a resource both in structure and semantics. The latter is the advantage of XML. XML is a technology dependent on content and Internet flat - independent. On the basis, we propose a metadata form which is imbedded among resources based on XML, as a result of which a new data resource format can be integrated. First. Change each kind of possible form (PDF, CAJ, RTF, etc.) into XML, Second. Make and change XML mark into a conversion rule of HTML mark. After that, the old format of the resources are transmitted to the new format, which can be showed by the browser directly.