XML DTD Design for exchanging NGIS Meta Data

摘要

PURPOSE: A data transmission system is provided to design an XML DTD(Document Type Definition) as a standard schema for an NGIS(National Geographic Information System) metadata in order to use the NGIS metadata as a common data type without other additional tasks at a data transmission or receiving side. CONSTITUTION: The system comprises a common NGIS DTD(50), a data transmitter(10), and data receivers(20a, 20b, 20c). The NGIS DTD(50) includes metadata contents of the NGIS. The data transmitter(10) includes the first XML parser for making the NGIS data into the NGIS XML data by referring to the common NGIS DTD(50) before transmitting the NGIS data to the data receivers(20a, 20b, 20c). The data receivers(20a, 20b, 20c) include the second XML parsers(40a, 40b, 40c) for detecting the effectiveness of the transmitted NGIS XML data and directly storing the NGIS XML data at an internal DBMS.