API: Retrieve metadata and content of an existing zettel manual api manual zettelstore zmk 00001006000000 00001012000000 00001012053200 00001012054200 00001006000000 00001012000000 00001012053200 00001012054200 00001012920000 1 (c) 2020-present by Detlef Stern 20211004093206 00001006050000 00001010040100 00001012050200 00001012053400 00001012920000 00001012920800 00001012921200 00001012930500 en EUPL-1.2-or-later 20230807170259 20230807170259 public