Re: Profile Best Practice document with alternative text about Policy and subclasses of Rule

Hi Michael, in relation to the “But” section below, I think the disjoint rule applies only to subclasses of Rule, not to subclasses of the “golden three” classes.

Cheers - Renato


> On 7 Jul 2020, at 00:19, Michael Steidl (NIT) <mwsteidl@newsit.biz> wrote:
> 
> Hi all,
> I’ve edited the ODRL Profile Best Practice page as agreed at the call:
> - basic approach: don’t change the ODRL Recommendation, and if required only minimal.
> - people should be reminded to check if the existing Permission, Prohibition and Duty classes meet their needs
> - if not: they should consider to define subclasses of Permission, Prohibition and Duty as this does not require to define a new Policy subclass
> - if not, again: advise them to create new subclass(es) of Rule and a new subclass of Policy – and remind them of “one of permission, prohibition or obligation properties MUST be used”.
> See the edited Note of https://w3c.github.io/odrl/profile-bp/#rule <https://w3c.github.io/odrl/profile-bp/#rule>
> And of https://w3c.github.io/odrl/profile-bp/#policy <https://w3c.github.io/odrl/profile-bp/#policy>
>  
> BUT there may be still the need to change the Recommendation:
> The Profile Mechanism (https://www.w3.org/TR/odrl-model/#profile-mechanism <https://www.w3.org/TR/odrl-model/#profile-mechanism>) defines: 
> Additional Rule class: Create a subclass of the Rule class and define it as disjoint with all other Rule subclasses.
> I think this “disjoint” requirement raises an issue: does creating a subclass of Permission/Prohibition/Duty (which are subclasses of Rule) require to meet this requirement?? (Formal detail: does “subclass of Rule” means only direct subclasses of Rule or also subclasses of subclasses or Rule.) 
> In other words: is it required to define a subclass of e.g. Permission as disjoint from Permission (I think this is formally impossible) ?
>  
> It this “define it as disjoint” does not work I suggest to modify this requirement in the Profile Mechanism – less impact on the ODRL Recommendation than changing the Information Model or the Vocabulary.
>  
> Would be great to hear views on that by RDF/OWL experts.
>  
> Thanks,
> Michael