Jürgen Weitkämper Thomas Brinkhoff XFormsGI - Extending XForms for Geospatial and Sensor Data. 76-93 2007 W2GIS http://dx.doi.org/10.1007/978-3-540-76925-5_6 conf/w2gis/2007 db/conf/w2gis/w2gis2007.html#WeitkamperB07