ER-Code:Extended region code based on Feature of GML documents
以Feature元素为单元的GML文档扩展区域编码ER-Code

Demanding on simultaneously carrying out the relations judgment of features' elements containment as well as features' geometry topotaxy in processing of GML path query, Tap the traditional XML path encode techniques analyzing, the paper designed an extended region code: ER-Code which takes the feature element as the unit of GML documents. Experimental results show that ER-Code has good performances on initial construct and holistic query based on ER-Code. In addition, integrating ER-Code and the feature sp...