status property for annotations

Does anyone know of an XML status property that could be used with the 
Annotation schema?  The idea is to implement simple work flow for 
annotations that happen to be "change requests" or "action items."

Bugzilla (http://www.bugzilla.org) has a status field in their database 
schema but they have not defined any XML schema.  Possible values are: 
UNCONFIRMED, NEW, ASSIGNED, REOPENED, RESOLVED, VERIFIED, CLOSED.  See: 
http://www.ravenbrook.com/project/p4dti/tool/cgi/bugzilla-schema/index.cgi?action=single&version=2.18&view=View+schema#notes-workflow).  


The minimum set of concepts I need are ASSIGNED, RESOLVED, and VERIFIED.

iCalendar (RFC 2245) defines a Status property (and there is some work 
on XML schema for iCal).  But the allowed values for "to do" kinds of 
items are:  NEEDS-ACTION, COMPLETED, IN-PROCESS, CANCELLED.  This would 
work fine, except there is no concept similar to VERIFIED.

Does anyone know where else to look for this kind of thing?

-Mark Smith
 Pearl Crescent, LLC