The Design and Implement of VO-DAS Registry

To provide a way to seamlessly access large distributed and multi-waveband data resources for astronomers, Virtual Observatory Data Access System (VO-DAS)was designed and is under developing by China-VO project.The VO-DAS Registry System serves VO-DAS as it gets and manages the metadata of both DataNode and tables of DataNode, which makes it possible to discover Datanodes automatically by VO-DAS. Furthermore, only with these metadata, VO-DAS can pass queries from users to set its running.As a matter of fact, VO-DAS Registry helps VO-DAS as it improves the query efficiency.We designed the VO-DAS Registry based on related IVOA standards.This article mainly describes the functions and designs of VO-DAS Registry.