The Flat File Serilaziser (CISSerializer) does not support XML comment!

If you put some comments within the XML result of your mappings (by using ) you might get a dodgy error message as follow, and your message will probably be stuck in the Work Queue:

Event Type: Error
Event Source: COM+
Event Category: SVC
Event ID: 4194
Date:  16/02/2009
Time:  15:09:43
User:  N/A
Computer: MyComputer
Description:
The system has called a custom component and that component has failed and generated an exception. This indicates a problem with the custom component. Notify the developer of this component that a failure has occurred and provide them with the information below. 
Component Prog ID: 
Server Application ID: {6ECD95AC-3C06-4A9B-9D43-4565C1BD3319}
Server Application Name: BizTalk Server Internal Utilities
Exception: C0000005
Address: 0x72E5DC94
Call Stack: 
msxml3!DllGetClassObject + 0x55FB
msxml3!DllGetClassObject + 0x589F
msxml3!DllCanUnloadNow + 0x1BA80
msxml3 + 0x7B9D1
CISSerializer!DllUnregisterServer + 0x110E3
CISSerializer!DllUnregisterServer + 0x1127C
CISSerializer!DllUnregisterServer + 0x1127C
CISSerializer!DllUnregisterServer + 0x129CF
CISSerializer!DllUnregisterServer + 0x97DC
CISENGINE!CSingleList::CSingleList(void) + 0x8624
CISENGINE!CSingleList::CSingleList(void) + 0x571F
CISENGINE!CSingleList::CSingleList(void) + 0x403F
CISENGINE!GetNewStateEngine(struct IInterchangeStateEngine * *) + 0x1354
CISENGINE!GetNewStateEngine(struct IInterchangeStateEngine * *) + 0x10A8
CISENGINE!GetNewStateEngine(struct IInterchangeStateEngine * *) + 0xBE0
CISENGINE!GetNewStateEngine(struct IInterchangeStateEngine * *) + 0x499
CISENGINE!GetNewStateEngine(struct IInterchangeStateEngine * *) + 0x6EE
CISENGINE!LKRhash::CLKRHashTable::End(void) + 0x5CAA
TxfAux + 0x35C61
ole32!CoCreateFreeThreadedMarshaler + 0x2EA1
ole32!CoCreateFreeThreadedMarshaler + 0x3160
ole32!CoCreateFreeThreadedMarshaler + 0x3517
TxfAux!CoGetInterceptorForOle32 + 0x2FD7
MSCIS!SchedulerRunning(void) + 0x105E
KERNEL32!lstrcmpiW + 0xB7