title: Zettelmarkup: Citation Key
role: manual
tags: #manual #zettelmarkup #zettelstore
syntax: zmk
back: 00001007010000 00001007040300 00001007721200
backward: 00001007010000 00001007040300 00001007721200
box-number: 1
copyright: (c) 2020-present by Detlef Stern <ds@zettelstore.de>
created: 20210810155955
forward: 00001007040000
lang: en
license: EUPL-1.2-or-later
modified: 20250102210258
published: 20250102210258
visibility: public

A citation key references some external material that is part of a bibliographical collection.

Currently, Zettelstore implements this only partially, it is &ldquo;work in progress&rdquo;.

However, the syntax is: beginning with a left square bracket and followed by an at sign character (&ldquo;`@`&rdquo;, U+0040), the citation key is given.
The key is typically a sequence of letters and digits.
If a comma character (&ldquo;`,`&rdquo;, U+002C) or a vertical bar character is given, the following is interpreted as [inline elements](00001007040000).
A right square bracket ends the text and the citation key element.