We should eventually allow users to input "some value" and "no value" everywhere they can input other values in the structured data UI, regardless of the datatype that is otherwise expected for a given value.
Wikidata uses three "dots" next to input elements, regardless of type – toggling between them lets the user select normal values (strings, entities, etc), unknown value (aka "somevalue"), or no value. If we choose to handle this differently, the solution still needs to work across all input elements.
- no value/somevalue displays in the UI
- no value/somevalue is deletable via edit mode
Top level somevalue example:
Qualifier level somevalue example: