Fwd: Combined Permissions and Restrictions in ODRL 2.0: Is this example correct?

From: Myles, Stuart 
Sent: Tuesday, February 21, 2012 1:40 PM
To: ODRL Community Group WG (public-odrl-contrib@w3.org)
Subject: Combined Permissions and Restrictions in ODRL 2.0: Is this example correct?
 
Hello,
 
I’m trying to represent the following set of permissions and restrictions in ODRL 2.0:
 
"It is permitted to make up to five printed copies of the content asset, for which a fee x must be paid in advance. It is permitted to make a further five printed copies, provided an additional fee x is paid in advance. It is prohibited to make more than ten printed copies in total."
 
Here’s the ODRL I have come up with, which does validate against the ODRL.xsd, as defined inhttp://www.w3.org/community/odrl/two/xml/, so it should at least be syntactically correct. But have I got the semantics right? Any feedback most welcome.
 
<?xml version="1.0" encoding="UTF-8"?>
<o:policy xmlns:o="http://w3.org/ns/odrl/2" type="http://w3.org/ns/odrl/2/set"
    uid="http://example.org/id/a123456">
    
    <!-- The permission: allow printing up to 5 times, as long as a printing fee is paid first -->
    <o:permission xmlns:a="http://iptc.org/std/RightsML/1.0/odrlvocab/"
        xmlns:ns="http://example.org/myRightsMLvocabulary">
        <!-- The Content Asset that is the target of the permission -->
        <o:asset uid="ns:myContentAsset" relation="target"/>
        <!-- The action being permitted is printing -->
        <o:action name="o:print"/>
        <!-- The action may be performed less than or equal to 5 times -->
        <o:constraint name="o:count" operator="o:lteq" rightOperand="5"/>
        <!-- The action is permitted as long as a duty is fufilled -->
        <o:duty>
            <!-- The duty action is to make a payment -->
            <o:action name="o:pay"/>
            <!-- The duty creates an asset (i.e. it is an output): the printing fee -->
            <o:asset uid="ns:printingFee" relation="output"/>
            <!-- The duty is constrained: the date/time of the duty must be before the date/time of action that is being permitted / restricted -->
            <o:constraint name="o:dateTime" operator="o:lt" rightOperand="a:actionDateTime"/>
            <!-- The duty is constrained: the duty must be performed exactly once -->
            <o:constraint name="o:count" operator="o:eq" rightOperand="1"/>
            <!-- The "pay" duty must specify the payeeParty, i.e. who gets paid? -->
            <o:party function="o:payeeParty" uid="http://example.org/id/me"/>
        </o:duty>
    </o:permission>

    <!-- The prohibition: don't print more than 10 copies altogether -->
    <o:prohibition>
        <o:asset uid="ns:myContentAsset" relation="target"/>
        <o:action name="o:print"/>
        <o:constraint name="o:count" operator="o:gt" rightOperand="10"/>
    </o:prohibition>
</o:policy>

Regards,

Stuart
 

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