[Odrl-version2] Constraints on duties - I think I've got it
now...
Susanne Guth
Susanne.Guth at gmx.net
Mon Jun 26 20:05:12 EST 2006
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
>
>
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> ODRL-Version2 at odrl.net
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--
Susanne Guth
susanne at odrl.net
ODRL Initiative
http://odrl.net/
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