[Odrl-version2] Core Model: relationship between Action and Duty

[Francis Cave]

Renato

I'm trying to interpret the cardinalities ('1' and '1') at both ends of 
the associations between the Action entity and each of the Permission, 
Prohibition and Duty entities in Figure 2.1. I may simply be showing my 
ignorance of how to interpret UML diagrams. :o) I understand the '1' at 
the Action end of each association, but I don't understand the '1' at 
the other end in each case.

Francis




ri at odrl.net wrote:

>
> On 6 Nov 2010, at 04:27, Francis Cave wrote:
>
>> In the revised Core Model a Duty is defined in terms of a single 
>> Action. Figure 2.1 appears to suggest that for any given Action there 
>> can only be a single Duty, and vice versa. Is this an error in the 
>> diagram? It must surely be possible to define multiple Duties that 
>> involve the same Action, presumably involving different Assets or 
>> different Constraints. Indeed, would not the same apply to 
>> Permissions and Prohibitions, involving the same Action but with 
>> different Constraints in each case?
>
>
> Duty has a "0..*" cardinality with Permission  - meaning you can have 
> multiple Duties for a single Permission.
>
> Scenario 3.6 in the Model shows this - there are two Duties (pay and 
> nextRights) for the distribute Permission.
>
> (hope that's what u meant!)
>
>
> Cheers
>
> Renato Iannella
> ODRL Initiative
> http://odrl.net
>
>
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