Adding MultiSpectrum to SpectrumDM (v1.3??)

[Dubois-Felsmann, Gregory P.]

Dear colleagues,

I had the impression that we had an initially positive response at the session this week to the suggestion that we proceed with adding something like our "ipac:MultiSpectrum" to SpectrumDM.  That was very encouraging!

This was our (SPHEREx's) presentation:

https://wiki.ivoa.net/internal/IVOA/InterOpJune2026DAL/SPHEREx-bulk-spectra-IVOA-20260611.pdf

We made an initial presentation on this at the late-2023 InterOp:
https://wiki.ivoa.net/twiki/bin/view/IVOA/InterOpNov2023DM
https://wiki.ivoa.net/internal/IVOA/InterOpNov2023DM/pdf-IVOA-multi-spectrum.pdf

What is the next reasonable step to take?  Submit a PR to the standard repo?

I'm happy to work on it but I feel a little out of my depth in being sure that I've understood the full gestalt of the existing document.  Would we need to figure out how to support MultiSpectrum in the FITS serialization as well, in order to proceed?

Many thanks,
Gregory