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: 00010101000000
forward: 00001007040000
lang: en
license: EUPL-1.2-or-later
modified: 20220218133447
published: 20220218133447
visibility: public

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

Currently, Zettelstore implements this only partially, it is ""work in progress"".

However, the syntax is: beginning with a left square bracket and followed by an at sign character (""''@''"", U+0040), a the citation key is given.
The key is typically a sequence of letters and digits.
If a comma character (""'',''"", 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.