Abstract
Metadata plays important role in the Qinghai-Tibet railway geographical database which storing and managing a mass of heterogeneous data. There are two types of matadata in this system. One is geographical metadata, which describes geographical background data、DTM、engineering data of railway and frozen soil data etc. The other is non-spatial metadata including attribute data and business data which be used to describe drill、article and field observation data. Both of metadata adopt different criteria. So it's necessary to use metadata crosswalks to solve the compositive access to datasets using different metadata criteria, so as to provide user a high-quality service of search and index. XML is the best choice. This paper discusses the applicability of Metadata crosswalks in the Qinghai-Tibet railway geographical database and implementation questions.
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