[Odrl-version2] RE: ODRL-Version2 Digest, Vol 17, Issue 3

[Vicky Weissman]

Hi Renato,

I'm sorry but I still don't understand.  More precisely, your encoding makes
perfect sense, and the question I was trying to answer using the example is
still open.  Let me try to ask the question again.  Suppose an agreement
gives Alice  permission to download a file f; this policy is associated with
the duty "pay 5 dollars"; the Boolean flag is not set (so the duty must be
fulfilled before the permission is granted); and this duty is associated with
a constraint c.  Which of the following should we conclude (or should we
conclude something else)?

(a) If c holds and Alice pays 5 dollars, then she may download f.

(b) If c does not hold, then Alice may download f; if c does hold, then Alice
may download f if she pays 5 dollars.

Note: (a) suggests that a constraint c associated with a duty is the same as
c associated with a permission; (b) suggests that the constraint on the duty
says whether the duty must be fulfilled; and, as far as I can tell, neither
interpretation can be used to say that Alice may download f (now) if she pays
5 dollars by the end of the month (sometime in the near future).  

Thanks for the help,
Vicky

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Subject: ODRL-Version2 Digest, Vol 17, Issue 3
 
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Today's Topics:

   1. Re: Discussion of ODRL v2.0 Model (Cont) (Renato Iannella)


----------------------------------------------------------------------

Message: 1
Date: Mon, 5 Jun 2006 12:06:00 +1000
From: Renato Iannella <renato at odrl.net>
Subject: Re: [Odrl-version2] Discussion of ODRL v2.0 Model (Cont)
To: "ODRL Version 2.0" <odrl-version2 at odrl.net>
Message-ID: <FC4F6D9C-740F-46A1-BA6A-18356FD0BBC8 at odrl.net>
Content-Type: text/plain; charset="us-ascii"


On 4 Jun 2006, at 12:56, Vicky Weissman wrote:

> So suppose an agreement gives Alice permission to print a file f  
> and, if she prints it more than 100 times, then she has to pay 5  
> dollars.  We'd write this as permission=print, asset = f, duty =  
> pay, object (of duty) = 5 dollars, and constraint (of duty) =  
> number_of_copies_by_consumer <= 100.  Yes?

We can break this down into two permission statements:

====Permission 1======
Asset = f
Permission = print [Constraint <= 100]
====Permission 1======

====Permission 2======
Asset = f
Permission = print [Constraint > 100]
Duty = Pay [amount = AUD5]
====Permission 2======

This way the constraint related to printing is associated with the  
Permission, not the Duty.

Is this a clearer ???

Cheers...  Renato Iannella

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