title: Zettelmarkup: Evaluation Blocks role: manual tags: #manual #zettelmarkup #zettelstore syntax: zmk back: 00001007030000 00001007031400 00001007800000 00001012920513 backward: 00001007030000 00001007031400 00001007800000 00001012920513 box-number: 1 copyright: (c) 2020-present by Detlef Stern created: 20220310184916 forward: 00001007050000 00001008000000 00001008050000 00001012920516 lang: en license: EUPL-1.2-or-later modified: 20230109105402 published: 20230109105402 visibility: public Evaluation blocks are used to enter text that could be evaluated by either Zettelstore or external software. They begin with at least three tilde characters (""''~''"", U+007E) at the first position of a line. You can add some [[attributes|00001007050000]] on the beginning line of a verbatim block, following the initiating characters. The evaluation block supports the default attribute[^Depending on the syntax value.]: when given, all spaces in the text are rendered in HTML as open box characters (U+2423). If you want to give only one attribute and this attribute is the generic attribute, you can omit the most of the attribute syntax and just specify the value. It will be interpreted as a [[syntax|00001008000000]] value to evaluate its content. Not all syntax values are supported by Zettelstore.[^Currently just ""[[draw|00001008050000]]"".] The main reason for an evaluation block is to be used with external software via the [[sz encoding|00001012920516]]. Any other character in this line will be ignored Text following the beginning line will not be interpreted, until a line begins with at least the same number of the same characters given at the beginning line. This allows to enter some tilde characters in the text that should not be interpreted. For example: ```{="zmk"} ~~~~ ~~~ ~~~~ ``` will be rendered in HTML as: :::{="example"} ~~~ ~~~ ~~~ ::: ```{="zmk"} ~~~{-} This is some text with no real sense. ~~~~ ``` will be rendered as: :::{="example"} ~~~{-} This is some text with no real sense. ~~~ ::: ```{="zmk"} ~~~draw +---+ +---+ | A | --> | B | +---+ +---+ ~~~ ``` will be rendered as: :::{="example"} @@@svg @@@ :::