Based On The Xml Library Metadata System

With the popularization of Internet and wide application of information technology, people put forward of their new need of how to get knowledge and technique. They hope that they can get the information service at home. So the library, as a place to spread abroad knowledge and technique, has a newly historic role. It is because of this that the electronic library, as a great historic problem task, is thought much of by more and more people. And the Metadata technology, as a most important technology which supports the electronic library, has gotten much development these years.XML's full name is Extensible Markup Language. It is a meta-language, which describes other languages. Metadata is about data's data. It is the description and explaining of other data. In the book information system, the metadata is used to describe the content of book information and to help people to understand and manage and look up book information. This paper discusses the technology of XML and Metadata, which is important to the electronic library. Deep study of Metadata's expression, transformation and query is offered. It analyzes some XML technologies, such as XML Schema, XSLT, XQuery, etc. Based XML, a book Metadata system is designed and partially realized. Virtual policy of how to save and query Metadata is given.