[Odrl-version2] Still not sure about constraints on duties

[Susanne Guth]

Vicky,

just a comment on your last comment. Duties can contain Actions (such as Attribution) or Objects. Therefore, the duties in ODRL Version 2.0 totally cover the v1.0 requirements.

Susanne



> -------- Original-Nachricht --------
> Datum: Thu, 8 Jun 2006 10:14:58 -0400
> Von: Vicky Weissman <vickyw at cs.cornell.edu>
> An: odrl-version2 at odrl.net
> Betreff: [Odrl-version2] Still not sure about constraints on duties
> &#xA> Hi Renato,
> 
> If I understood your response correctly, then the following two statements
> are equivalent.  
> 
> Party=Alice
> Perm=Download
> Asset=F
> Duty=d
> Duty.Constraint=c
> 
> Party=Alice
> Perm=Download
> Asset=F
> Duty=d
> Constraint=c
> 
> Is this right?  If so, why allow duties to have constraints at all?
> 
> --------------
> 
> Again, if I understood correctly, then
> 
> Party=Alice
> Perm=Download
> Asset=F
> Duty=Pay[amt=5]
> Duty.Constraint=Date[before30June06]
> 
> says that Alice may download F if she has paid 5 and the current date is 
> before June 30, 2006.  So the encoding does not match the example I gave;
> namely, Alice may download F (now) if she pays 5 dollars at the end of the
> month.  Examples of similar policies in real life include credit card 
> policies (you can buy what you want but are obligated; that is, have a 
> duty, to pay a certain percentage of your balance at the end of the month)
> and traditional library policies (you can check out a book but are 
> obligated to return it within 2 weeks).  
> 
> I could understand if ODRL was not interested in capturing such policies 
> but then having a construct called a "duty" seems odd.   
> 
> ---------------
> Finally, is it true that duties can only require some party to make a 
> payment, or could a duty require other types of actions such as
> attribution 
> being given?  (Note: if a duty can only discuss a payment, then duties
> are 
> less expressive than requirements as defined in v1.0, although maybe 
> requirements in v1.0 can be captured by constraints in v2.0.)
> 
> Thanks,
> Vicky

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

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