Slide 24 of 29
This shows a single object with temporally related “geometry attributes”. Multiple geometric representations are widely agreed as being necessary (the OpenGIS Consortium abstract specification uses them). They cannot really be used for t-GIS because (a) the non-spatial attributes must be the same for all times, (b) there is no easy way to annotate the different geometries with the relevant (valid) timestamp.
This can be done, but whether it is useful or not is highly dependent on detailed non-fundamental OO GIS facilities.
The <evidence> relationships have to have valid timestamps themselves, and these must somehow be matched 1;1 with the geometries.
