horizontal label data model/context

[znichollscr]

Is validation-key meant to be the value or are we missing a key that holds the actual horizontal label, separate from id (a unique, lowercase id), validation-key (not clear if this is the value) and ui-label (a human-readable version for display, not the actual value).

[znichollscr]

answered in #87 (comment)

[wolfiex]

This is a branding identifier. https://github.com/WCRP-CMIP/Variable-Registry/tree/main/src-data/horizontal-label

Anything in the context - will tell you where it is linked.