SEARCH METHOD OF DISTRIBUTED/HETEROGENEOUS GIS DATABASES USING METADATA INTERCHANGE STANDARD

摘要

PURPOSE: A distributed different database search method using an XMI(XML Metadata Interchange) is provided to search a position of a GIS(Geographic Information System) DB and a schema relating to the position. CONSTITUTION: Each GIS DB(10,20,30) encodes the information into an XML(extensible Markup Language) document of an XMI format by using an XMI conversion program after expressing an independent DB schema as a UML(Unified Modeling Language). IF a URL(Uniform Resource Locator) of each XML file is registered to a meta search server(40), the server stores each DB schema information extracted from the XMI file by an XML parser in an XMI DB(50). If the user connecting to the server requests a GIS information search, the server dynamically generates an SQL(Structured Query Language) query matching to each DB schema by inquiring to the XMI DB and displays a result of the query to the user.