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


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Timestamp:
15.07.2014 16:42:56 (6 years ago)
Author:
jri
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  • Ticket #679, comment 1

    initial v1  
    11An **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. 
    22 
    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. 
     3In 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.