A resultsFilter allows an administrator
to limit the scope of a find, count, reset, or
terminate operation to only those notifications
which match the specified requester, service, and
operation conditions. If a particular condition
is not present, no statement about the operation's
resulting notifications is implied.
For example, including a requesterLike
condition requires that the notification requesters
in the result all match the requesterLike condition
in the filter. Not including a requesterLike
condition implies nothing about the notification
requesters in the operation results.
Each subelement defines its own content
semantics.