Hi!

I wonder if a RPID document without a tuple element is allowed and makes 
sense.

Scenario: A presence user agent publishes a person's activities, e.g. 
retrieved from a calender. If I understand it right, the tuple 
represents the service. Thus, as this presence user agent does not offer 
any services for communicating I think it makes sense to omit the tuple 
element.

Further, accordig to RPID :
 >   there can be multiple elements of the same type, whose time ranges
 >   SHOULD NOT overlap.

Further, is it allowed to have multiple activities, ie. describing the 
next activities?

Example:

<?xml version="1.0" encoding="UTF-8"?>
<presence xmlns="urn:ietf:params:xml:ns:pidf"
      xmlns:dm="urn:ietf:params:xml:ns:pidf:data-model"
      xmlns:lt="urn:ietf:params:xml:ns:location-type"
      xmlns:rpid="urn:ietf:params:xml:ns:pidf:rpid"
      entity="pres:[email protected]">
   <dm:person id="calender01">
     <rpid:activities from="2010-05-30T12:00:00+02:00"
        until="2010-05-30T17:00:00+02:00">
        <rpid:note>SIMPLE Strategy</rpid:note>
        <rpid:meeting/>
     </rpid:activities>
     <rpid:activities from="2010-05-30T17:00:00+02:00"
        until="2010-05-30T18:00:00+02:00">
        <rpid:note>jour fixe</rpid:note>
        <rpid:meeting/>
     </rpid:activities>
     <rpid:place-type><lt:office/></rpid:place-type>
     <rpid:sphere>work</rpid:sphere>
     <dm:timestamp>2010-05-30T16:09:44+02:00</dm:timestamp>
   </dm:person>
</presence>

Summary:
1. Is it allowed to omit the tuple element?
2. Is it fine to have multiple activities elements within a single 
person element?

Thanks
Klaus
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