[Odrl-version2] Constraints on duties - I think I've got it now...

[Susanne Guth]

Hi Renato,

just a comment.
We do have Assigner and Assignee in the Model relating the Party and the Duty element. Did you mean somewhere else?

So long
Susanne

-------- Original-Nachricht --------
Datum: Fri, 23 Jun 2006 21:51:13 +1000
Von: Renato Iannella <renato at odrl.net>
An: "ODRL Version 2.0" <odrl-version2 at odrl.net>
Betreff: Re: [Odrl-version2] Constraints on duties - I think I\'ve got it	now...

> 
> On 21 Jun 2006, at 04:28, Vicky Weissman wrote:
> 
> > Party=Alice
> > Perm=Download
> > Asset=F
> > Duty=d
> > Duty.Constraint=c
> > Duty.Relax = false
> >
> > means that Alice may download F if she has (1) fulfilled duty d at  
> > time t and
> > (2) at time t, constraint c holds.  So, if d = "pay 5 Euros" and c  
> > is "time
> > is before June 30, 2006", then Alice may download F if she has  
> > already paid 5
> > euros and that payment was made before June 30, 2006.
> >
> > Assuming this correct,
> 
> Yes...
> 
> > I wonder if duties should have (optional) consequences.  For  
> > example, maybe
> > the agreement owner would like to say "Alice may lock f.src; she  
> > should
> > return the lock within 24 hours, and, if she doesn't return the  
> > lock, then
> > she'll be charged one Euro a day".  More generally, relaxed duties  
> > allow
> > obligations to hold after the right has been granted/exercised, so  
> > I think
> > it'd make sense (and is often the case in practice) for there to be
> > consequences to unmet obligations.  What do you think?
> 
> I like this idea. We should introduce the "unmet" entity for Duties  
> (that can take any Action)
> 
> So your example might now look like:
> 
> Party=Alice
> Perm= lock
> Asset= f.src
> Duty= unLock
> Duty.Constraint= within 24 hours
> Duty.Unmet = EU1/day
> 
> When can then use the null case, that is "Duty.Unmet=null" to be the  
> same as Duty.Relax=true.
> Ie you can not meet the duty, but nothing will happen
> 
> > Party=Alice, Bob
> > Perm= download
> > Asset= F
> > Duty= pays 1 euro
> > Duty.Constraint= user is over 21
> > Duty.Relax = false
> >
> > This means (1) if Alice is over 21, then she may pay 1 euro and, if  
> > she pays
> > the euro, then she may download F.  The same is true for Bob.  So the
> > agreement is equivalent to one that says "Alice/Bob may download F  
> > if she/he
> > is over 21 and pays a euro".  That is, the agreement is equivalent to
> >
> > Party=Alice, Bob
> > Perm= download
> > Asset= F
> > Duty= pays 1 euro
> > Perm.Constraint= user is over 21
> > Duty.Relax = false
> 
> Your first example means that the person paying needs to be over 21,  
> whereas the second example
> means you need to be over 21 to download the file (both are valid  
> examples)
> 
> Now, we need to be clear on the multiple parties you have listed. We  
> have the concept of "assignee"
> and "assignees" in our model. The former is for a single party, and  
> the latter for multiple parties
> (although you identify that latter group with a single identifier)  
> and each of the members of that group
> receives the same set of Permissions and Prohibitions. (We should  
> extend that to Duties as it is not in the
> model yet).
> 
> So if we use Party.assignees=alice-n-bob-group-id, then each member  
> of that group would get the permission
> and be liable for the Duty, unless we use Duty.assignee=alice-n-bob- 
> group-id.
> 
> 
> > ----
> > (This one's really about parties v. individuals.)
> >
> > Party=Alice
> > Perm= download
> > Asset= F
> > Duty= pays 1 euro
> > Duty.Assignee = {Alice, Bob}
> > Duty.Beneficiary = {Charlie, Dan}
> > Duty.Relax = false
> >
> > The agreement says that Alice may download F if {Alice, Bob} has  
> > paid 1 euro
> > to {Charlie, Dan}.  Suppose Bob gives a euro to Charlie.  Then does it
> > necessarily follow that {Alice, Bob} has given a euro to {Charlie,  
> > Dan} and,
> > thus, Alice may download F?
> 
> Since you used "assignee" then yes.
> 
> Does that make sense?
> 
> 
> Cheers...  Renato Iannella
> National ICT Australia (NICTA)
> 
> 
> 
> 
> Cheers
> 
> Renato Iannella
> ODRL Initiative
> http://odrl.net
> 
> 
> _______________________________________________
> ODRL-Version2 mailing list
> ODRL-Version2 at odrl.net
> http://lists.odrl.net/mailman/listinfo/odrl-version2

-- 
Susanne Guth
susanne at odrl.net
ODRL Initiative
http://odrl.net/

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