Context Navigation

Changes between Initial Version and Version 1 of Ticket #679, comment 1

initial	v1
1	1	An unidirectional association between topics A and B would mean that you can navigate from A to B but not vice-versa. I assume what you actually mean is the distinction of directed associations vs. undirected associations.
2	2
3		In DM2 associations are directed. That is there are dedicated start and end points. In DM4 in contrast we deliberately decided NOT to have directed associations (because in most cases there is no clear start and end, e.g. what would be the start of a ~~parent-child~~ relationship?) but to qualify the 2 topics by the means of ''Role Types''. So you could define the Role Types ''start'' and ''end'' on your own.
	3	In DM2 associations are directed. That is there are dedicated start and end points. In DM4 in contrast we deliberately decided NOT to have directed associations (because in most cases there is no clear start and end, e.g. what would be the start of a ''parent-child'' or a ''membership'' relationship?) but to qualify the 2 topics by the means of ''Role Types''. So you could define the Role Types ''start'' and ''end'' on your own.