What's the Null values section in the double-click-the-header help?

[turbomam]

No description provided.

[turbomam]

Possibly see also #243

[ddooley]

At moment there is a feature in DH that allows the "data status" column of a template (in data.tsv) to be a (nominal) list of permitted null values - e.g. "Not Applicable; Missing; Not Collected; Not Provided; Restricted Access" to be added in addition to whatever field validation is applicable to a field (decimal, date, enumerated list). The double click header help lists off the allowed null value tokens for the field.

[ddooley]

I don't quite know how to multiplex/demultiplex this into the LinkML specification though. See linkml/linkml#178

[turbomam]

Thanks, that makes sense

[ddooley]

The ability to specify multiple ranges provides a solution for having null value categorical choices added to any desired field, so will implement that solution, per bottom of linkml/linkml#178

[ddooley]

This is now done on the WIP-validation branch which will be merged soon.