reference file schemas and crds selectors

[braingram]

As discussed: #256

Reference file schemas place restrictions on selectors that match keywords in science files. These restrictions prevent the use of more complicated selectors (like BETWEEN 0 50 for a keyword that is typically an integer).

[braingram]

Based on the described selectors here (I'm not sure if these are the same for jwst):
https://hst-crds.stsci.edu/static/users_guide/rmap_syntax.html?highlight=between#selectors

Inclusion of a string type (or perhaps removal of the type constraint) should allow for most of the selectors (except for tuple selectors). I'm not sure how the tuple selectors are encoded in the fits header for reference files.

[braingram]

I'm not sure if there is some filtering between crds selectors and keywords (and perhaps this BETWEEN selector can be filtered like it appears the other selectors are being filtered). For example, with the following rmap:
https://jwst-crds.stsci.edu/browse/jwst_miri_mask_0022.rmap
the selector:

    ('MIRIFULONG', 'GENERIC', 'FAST|FASTR1', 'BETWEEN 0 50') : UseAfter({
        '2022-04-01 00:00:00' : 'jwst_miri_mask_0053.fits',
        '2022-07-12 17:08:30' : 'jwst_miri_mask_0057.fits',
        '2023-02-01 16:54:24' : 'jwst_miri_mask_0052.fits',
        '2023-09-28 16:04:12' : 'jwst_miri_mask_0054.fits',
    }),

Contains a tuple selector (I'm not sure I'm using terms here that match the crds conventions).

('MIRIFULONG', 'GENERIC', 'FAST|FASTR1', 'BETWEEN 0 50')

Note the last two items FAST|FASTR1 and BETWEEN 0 50 corresponding to READPATT and NGROUPS. Looking at the 4 selected files, all contain FASTR1 for READPATT and BETWEEN 0 50 for NGROUPS. This led me to a few questions:

• Why is the READPATT selector FAST|FASTR1 if all files are FASTR1?
• Does crds generate the selector from the file(s) or is this separately defined?

[braingram]

It's possible this is related to the 'tpn' files which does have a constraint for READPATT but not for NGROUPS:
https://jwst-crds.stsci.edu/browse/jwst_miri_mask_0057.fits
or with the crds submission process where possibly READPATT is filtered and NGROUPS is not.