[QGIS-Developer] What are "Key/value" and "List" widgets in attributes form?

[DelazJ]

Hi all,

In the vector layer properties dialog, Attributes form tab, I fail to
understand/find what enables those two widgets, hence what they are
supposed to do and how they could work.

If someone has some information, thanks for sharing.
Documenting this section is blocked by these information (see
https://github.com/qgis/QGIS-Documentation/pull/2437/files)


Thanks,
Harrissou
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