This topic includes the basics for feature based modelling. There are a number of standards also relevant for this topic (see relations). The following items should be included: - Definition of a feature (in some literature also called object, or geoobject) and of feature classes respectively. - Aspects of the definition (ID, geometry, topology, thematic, time etc.) - Techniques for the definition of features / feature classes (mainly link, as they are described elsewhere, see relations)