共 2 条
[1]
Virtual Environments and GIS. NEVES J N,C MARA A. Geograp- hical Information Systems . 1999
[2]
Extensible Markup Language (XML) 1.0. Bray T,Paoli J,Sperberg-McQueen CM. http://www.w3.org/TR/1998/REC-xml-19980210.html . 1998