Thanks, Smit. I’ve read about that on the property chat for P21. I haven't been able to get it to work. Here’s an example (I know this person’s gender and fixed the statement after taking this screen shot of my feeble attempt at “unknown value”). Am I doing it wrong?

-----Original Message-----
From: Smit <me@smitop.com>
Sent: Friday, May 14, 2021 3:30 PM
To: Crystal E. Clements <cec23@uw.edu>; wikidata@lists.wikimedia.org
Subject: Re: [Wikidata] Given Names and Sex/Gender for Humans in Wikidata

On 2021-05-14 6:22 p.m., Crystal E. Clements wrote:

> Given the fact that people with many gender identities face

> persecution and may not want to make their gender identity public, and

> given the fact that harm can be done by wrongly assuming someone’s

> gender identity on Wikidata, I think both a protection class and

> citation needed constraint are overdue for P21.

Note that this is currently handled by setting that property to "unknown value" and adding an explanation in a reference.