[Cosmo-dev] new eim record type for event overrides

[Randy Letness]

Currently, there is a single event record type that is used to represent 
master events and override events.  Override events are represented by a 
non-null "RecurrenceId" attribute.  This means that the primary key for 
event records is really the event uuid and the recurrenceId.  This is a 
problem for master events, because they have a null recurrenceId.  Also, 
override events will never use rdate, exdate, rrule, exrule.

After talking to Brian, he proposed having a separated record type to 
represent override events.  This new "override" record type would have 
two key fields, uuid and recurrenceId, and the current event recordtype 
would no longer need the recurrenceId attribute.  So things look like:

<event:record xmlns:event="http://osafoundation.org/eim/event">
      <event:uuid eim:type="text" eim:key="true"><![CDATA[e55b5f1c-a20d-4d47-acda-c43049967281]]></event:uuid>
      <event:dtstart eim:type="text"><![CDATA[20061220T090000]]></event:dtstart>
      <event:dtend eim:type="text"><![CDATA[20061220T100000]]></event:dtend>
      <event:location eim:type="text"><![CDATA[]]></event:location>
      <event:rrule eim:type="text" />
      <event:exrule eim:type="text" />
      <event:rdate eim:type="text" />
      <event:exdate eim:type="text" />
      <event:status eim:type="text" />
</event:record>

<eventOverride:record xmlns:event="http://osafoundation.org/eim/eventOverride">
      <eventOverride:uuid eim:type="text" eim:key="true"><![CDATA[e55b5f1c-a20d-4d47-acda-c43049967281]]></eventOverride:uuid>
      <eventOverride:recurrenceId eim:type="text" eim:key="true"><![CDATA[20061220T090000]]></eventOverride:recurrenceId>
      <eventOverride:dtstart eim:type="text"><![CDATA[20061220T090000]]></eventOverride:dtstart>
      <eventOverride:dtend eim:type="text"><![CDATA[20061220T100000]]></eventOverride:dtend>
      <eventOverride:location eim:type="text"><![CDATA[]]></eventOverride:location>
      <eventOverride:status eim:type="text" />
</eventOverride:record>

Does this make sense?  Comments, suggestions, concerns?

-Randy