Lucas_Werkmeister_WMDE added a comment.

  Thanks a lot! I added labels in P10540#61224 
<https://phabricator.wikimedia.org/P10540#61224>. In combination with the total 
counts from T244341#5920206 
<https://phabricator.wikimedia.org/T244341#5920206>, my interpretation of the 
top entries is:
  
  - Out of the 77859 “described by source: //unknown value//” statements, 77855 
have a “named as” qualifier. **In “described by source”, //unknown value// 
virtually always means “some value, see ‘named as’”.** Other common qualifiers, 
such as “determination method” and various external identifiers, seem unrelated 
to the interpretation of the //unknown value// snak.
  - Out of the 57564 “publisher: //unknown value//” statements, 56081 have a 
“stated as” qualifier. **In “publisher”, //unknown value// overwhelmingly means 
“some value, see ‘stated as’”.** (I’m vaguely curious if the choice of “named 
as” vs. “stated as” has any significance, or if it’s just the result of two 
different people doing separate imports and happening to pick different but 
related properties.)
  - Out of the 13772 “date of death: //unknown value//” statements, 4143 have 
an “earliest date” qualifier, and 864 have a “latest date” qualifier. **In 
“date of death”, //unknown value// usually does mean “unknown”, though the 
qualifiers can sometimes constrain the possible range.**
  - Out of the 12792 “given name: //unknown value//” statements, almost none 
have any qualifier at all (top entry in P10540 
<https://phabricator.wikimedia.org/P10540> is “applies to part”, 34 times). 
**In “given name”, //unknown value// means “unknown”.** I’m not sure in which 
case this would be used, by the way – even if the external source only recorded 
an initial, for example, we have items we can use for that (such as S. 
<https://www.wikidata.org/wiki/Q19803518>) instead of //unknown value//.
  - Out of the 10054 “date of birth: //unknown value//” statements, 690 have a 
“latest date” qualifier, and 384 have an “earliest date” qualifier. **In “date 
of birth”, like in “date of death”, //unknown value// usually means “unknown”, 
possibly constrained by qualifiers.**
  - Out of the 5398 “place of birth: //unknown value//” statements, almost none 
have any qualifier at all (top entry in P10540 
<https://phabricator.wikimedia.org/P10540> is “country”, 42 times). **In “place 
of birth”, //unknown value// means “unknown”.** Those cases with a “country” 
qualifier should probably just enter the country directly into the statement?
  - Out of the 5397 “inception: //unknown value//” statements, 336 have a 
“latest date” qualifier, and 273 have an “earliest date” qualifier. **In 
“inception”, //unknown value// means “unknown”, as in “date of birth/death”.**
  - ...skipping some...
  - On the 1534 “editor: //unknown value//” statements, there are 2192 “stated 
as” qualifiers and 1630 “series ordinal” qualifiers. This doesn’t really match 
up (possibly due to the analyses having run at different times? could somebody 
have added that many other “editor” statements in between?), but it seems that 
**in “editor”, //unknown value// typically means “some value, see ‘stated 
as’”.**
  
  In conclusion: “unknown value” actually meaning “unknown value” is still 
common (especially for “time”-type properties); that said, the most common uses 
really mean “some known value that doesn’t have an item yet”.

TASK DETAIL
  https://phabricator.wikimedia.org/T246238

EMAIL PREFERENCES
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To: JAllemandou, Lucas_Werkmeister_WMDE
Cc: elukey, JAllemandou, Lea_Lacroix_WMDE, Gehel, Aklapper, dcausse, Igorkim78, 
Lucas_Werkmeister_WMDE, Jheald, darthmon_wmde, Nandana, Lahi, Gq86, 
GoranSMilovanovic, QZanden, EBjune, merbst, LawExplorer, _jensen, rosalieper, 
Scott_WUaS, Jonas, Xmlizer, jkroll, Smalyshev, Wikidata-bugs, Jdouglas, aude, 
Tobias1984, Manybubbles, Mbch331
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