The ability to send Update Signals (rather than Audits) is missing in JDF.
We built a solution in XJDF that should be added to 1.7
<copy ReplaceBefore and ReplaceAfter from SignalStatus to Signal>
|ReplaceBefore ?||...||The data from previous SignalStatus messages with the same Header/
@DeviceID @SenderID and a Header/@Time after the time specified by @ReplaceAfter and
prior to the time specified by @ReplaceBefore SHALL be replaced by data in
this SignalStatus. @ReplaceAfter SHALL be specified if @ReplaceBefore is
specified. If @ReplaceAfter and @ReplaceBefore are not specified, this
SignalStatus is the original and SHALL NOT replace a previous SignalStatus.
<analog for ReplaceAfter>