Provide format-specific phenomenon identity for load and save
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pp-mo commented
Summary : a solution like the 'STASH' attribute, to carry grib-specific parameter identity.
At present, if you want to save Iris data for which no known parameter code translation exists, it just gets a 0, so you can't save multiple such things to one file.
Likewise on load, an unknown parameter code just results in an 'unknown' or anonymous cube
-- and maybe we can even wind up merging things that should be kept separate ??
I'm imagining a specially recognised cube attribute, along the lines of 'STASH' for PP+FF encoding.
It needs to encode : (edition, discipline parameterCategory, parameterNumber). We can probably handle GRIB1 in that form somehow, not clear on detail yet.