Document our recommendations for versioning of overlays, etc.
We expect that raw data formats can change over time, so we should develop, document, and possibly demonstrate a recommendation for the best way to do this in overlay classes.
We have an example of a way to do this in the NOvA DAQDataFormats package. I'm sure that there are other ideas and examples, also. I added a version number field to the LBNE 35-ton data classes that I wrote, but I didn't actually implement versioning.
If we decide that we want to demonstrate our preferred model, we could use the artdaq::Fragment class to do that.