[Odrl-version2] Duty?

[Myles, Stuart]

Thanks, Renato - that makes a lot more sense.  I was mislead by my
reading of the ODRL Model picture.

(Shortly after I sent my email, I thought of another reason why
constraints and duties are completely different- in evaluating an ODRL
instance to determine whether a particular use is permitted, only the
constraints should be checked for violations.  The duties would turn
into actions that need to be performed only if an asset it used).

Regards,

Stuart


-----Original Message-----
From: odrl-version2-bounces at odrl.net
[mailto:odrl-version2-bounces at odrl.net] On Behalf Of ri at odrl.net
Sent: Tuesday, March 23, 2010 8:29 AM
To: ODRL-Version2
Subject: Re: [Odrl-version2] Duty?

Stuart - the current Draft Spec Model [1] defines the difference between
Constraints and Duties:

Constraint = indicates limits and restriction to the Permission, the
Prohibition and the Duty entity
Duty = indicates a requirement that must be fulfilled in return for
being entitled to the containing Permission entity

The WD Common Vocab [2] defines Attribution as a Duty (only).

>From the current WD XML Encoding [3], your 1st example may look like:

    <o:permission>
        <o:action name="http://odrl.net/2.0/action/display"/>
        <o:duty>
           <o:action name="http://odrl.net/2.0/action/attribution"/>
           <o:object measure="http://odrl.net/2.0/object/text"
value="Stuart Myles"/>   (*)
         </o:duty>
     </o:permission>

(*) need to add this to the Common Vocab

Cheers - Renato

[1] http://odrl.net/2.0/DS-ODRL-Model.html
[2] http://odrl.net/2.0/WD-ODRL-Vocab.html
[3] http://odrl.net/2.0/WD-ODRL-XML.html



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