jgg     2009 29 (4):  120-123    ISSN: 0412-1961  CN: 21-1139/TG ON KEY TECHNIQUES OF OPEN WEBGIS BASED ON GML SPATIAL DATABASE Lan Xiaoji and Han Linqin College of Architectural and Surveying Engineering, Jiangxi University of Science and Technology, Ganzhou 341000 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null