Boolean Value manual manual reference zettel zettelstore zmk 00001004010000 00001004020000 00001006020400 00001010070200 00001004010000 00001004020000 00001006020400 00001010070200 1 (c) 2020-present by Detlef Stern 20210212135017 00001006033500 en EUPL-1.2-or-later 20220304114040 20220304114040 public