gistfile1.txt

http://msdn.microsoft.com/en-us/library/dd633667.aspx
http://msdn.microsoft.com/en-us/library/exchangewebservices.calendaritemupdateoperationtype.aspx

relevant_ObjC_interface_I_think.m

// From /System/Library/PrivateFrameworks/ExchangeWebServices.framework/Versions/A/ExchangeWebServices

@interface EWSDeleteItemType : EWSBaseRequestType
{
    NSArray *ItemIds;
    int DeleteType;
    int SendMeetingCancellations;
    int AffectedTaskOccurrences;
}

+ (id)definition;
- (void)dealloc;
@property(nonatomic) int AffectedTaskOccurrences; // @synthesize AffectedTaskOccurrences;
@property(nonatomic) int SendMeetingCancellations; // @synthesize SendMeetingCancellations;
@property(nonatomic) int DeleteType; // @synthesize DeleteType;
@property(retain, nonatomic) NSArray *ItemIds; // @synthesize ItemIds;

@end

what_I_wish_ical_did.xml

<soap:Body>
      <m:DeleteItem DeleteType="MoveToDeletedItems" SendMeetingCancellations="SendToNone">
         <m:ItemIds>
            <t:ItemId Id="AAMkA=" ChangeKey="DwAAA" />
         </m:ItemIds>
      </m:DeleteItem>
   </soap:Body>

what_ical_does.xml

<soap:Body>
      <m:DeleteItem DeleteType="MoveToDeletedItems" SendMeetingCancellations="SendToAllAndSaveCopy">
         <m:ItemIds>
            <t:ItemId Id="AAMkA=" ChangeKey="DwAAA" />
         </m:ItemIds>
      </m:DeleteItem>
   </soap:Body>