2009/10/5 Andrew Errington <[email protected]>: > On Mon, October 5, 2009 15:36, Lester Caine wrote: > <snip> >> ( Egil - a little aside, while a check box for boolean would be nice, >> there is still an element of 'NULL' - that is in addition to setting a >> boolean tag, one still needs to decide if it should or should not be >> present ) > > Checkboxes these days /can/ represent three states. There are usually two > states: checked (or ticked) and not checked (an empty white box). In most > GUIs it is possible to represent a third state, perhaps a grey square > filling the box. (This is different from the control being disabled, > usually shown by being greyed-out). The meaning of this third state > depends on the application, but it can mean NULL, unknown, conflicting > source data, or whatever you want it to mean when it's not True or False. > > I'm not sure that this third state is particularly useful or intuitive, > but I know it means something different to True or False when I see it.
in JOSM-Preset there are indeed three states: yes, no and notset. Cheers, Martin _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
