EKR~+:A GML Holistic Index Method

Based on the analyzing of the GML data characteristics and the traditional spatial data indexing techniques and XML data indexing,this paper proposed structures and algorithms of GML holistic index(Extend K-Means R+:EKR+) to meet the need of semantic and spatial query of GML data,which based on geographical feature units joints extended regional codes and geometric attributes for the key index.And then,one semantic and spatial join algorithm based on EKR+index is designed.Finally,performances study show that our techniques outperform the traditional approach.