... 53classes 61, 77 desirable characteristics 53evaluation 53evolution in definition 61methods 66, 69, 75 , 76 overview 102properties 66, 72 , 74 , 77 scenarios 63 77 version management 77 structural ... models 2soil maps 35 space 17 absolute space 9relative space 13, 16 space- time entity representation 5 space- time maps 14 space- time path 16, 20–5configuration 21, 47 creation 58, 84demise ... 43, 50, 77 version proliferation 78 view 12– 17 absolute space- time view 12integrating absolute and relative views 16relative space- time view 14, 17 main characteristics 15visualisation of versions...