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TiddlyWiki5/editions/tw5.com/tiddlers/wikitext/Transclusion and Substitution.tid
Mario Pietsch a49436160d
Improve Filter Syntax documentation (#7368)
* Improve Filter Syntax documentaion / navigation

* update links and missing diagrams

* rename legacy prefix to shortcut prefix

* Update editions/tw5.com/tiddlers/filters/Filter Operators.tid

Co-authored-by: yaisog <m@rcuswinter.de>

* Update editions/tw5.com/tiddlers/filters/syntax/And Filter Run Prefix.tid

Co-authored-by: yaisog <m@rcuswinter.de>

* Update editions/tw5.com/tiddlers/filters/syntax/Sort Filter Run Prefix.tid

Co-authored-by: yaisog <m@rcuswinter.de>

* Update editions/tw5.com/tiddlers/filters/syntax/Sort Filter Run Prefix.tid

Co-authored-by: yaisog <m@rcuswinter.de>

* Update editions/tw5.com/tiddlers/filters/syntax/Sort Filter Run Prefix.tid

Co-authored-by: yaisog <m@rcuswinter.de>

* Update editions/tw5.com/tiddlers/filters/syntax/Cascade Filter Run Prefix.tid

Co-authored-by: yaisog <m@rcuswinter.de>

* Update editions/tw5.com/tiddlers/filters/syntax/And Filter Run Prefix.tid

Co-authored-by: yaisog <m@rcuswinter.de>

* add most changes a suggested by yaisog

* fix copy / paste from-version

* replace operand with parameter in the docs

* fix typo

* fix typos and improve railroad diagrams consistency

* move "new from version" info for filter run prefixes below the table

* fix typo transclusion and substitution

* Move Filters tiddler to the top level in the TOC

* wip-breadcrumbs

* breadcrumbs & breadcrumbsList macro final

* remove files that do not belong to this PR

* restore release banner

* add simple / story mode to breadcrumbs

* .breadcrumbs macro update comments

* new breadcrumbs CSS, woks with small screens

* make CSS configurable using hidden-settings

* improve CSS fro small screens

* remove the initial: recursiveParentTag macro

* improve location info for breadcrumbs nav. add "alt-text" for Edge ::after element

* breadcrumbs add mode=field

* bc add initial docs

* breadcrumbsField will also respect the story ordering

* add configurable global filterMode setting

* improve arrow CSS for browser zooming

* add bc links use bc-caption if caption field is non-empty

* breadcrumbs improve comments

* breadcrumbs aria-lable uses caption if there is one

* breadcrumbs improve documentation

* breadcrumbs improve docs for sort param

* fix showArrows docs

* remove .bc-link aria-label .. it's not needed if caption is resolved properly

* use subfilter instead of enlist to evaluate the "excluded" variable. Be consistent with toc-macros

* remove breadcrumbs macros - they have their own PR now

* resolve conflict

* add back doc-macros tiddler

* integrate :then filter run prefix

* remove .breadcrumbs macros and their config tiddlers

* fix typos as requested

---------

Co-authored-by: yaisog <m@rcuswinter.de>
2024-02-14 17:20:32 +01:00

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created: 20141018090608643
modified: 20231030124224424
tags: WikiText
title: Transclusion and Substitution
type: text/vnd.tiddlywiki
The power of WikiText comes from the ability to use the content of one tiddler inside another one. This ability takes several different forms that can easily be confused.
The main distinction is between a transclusion and a textual substitution:
* A transclusion is replaced dynamically with the value of either:
** a tiddler field
** a variable
* Textual substitutions are performed on the text of macro definitions before they are used
! Tiddler Field Transclusion
[[Transclusion in WikiText]] describes the basics of transclusion. For example:
```
{{MyTiddler}}
```
As described in [[HTML in WikiText]], you can also transclude tiddler field values as attributes of HTML elements and widgets. For example:
```
<$text text={{MyTiddler}}/>
```
As described in [[Introduction to filter notation]], you can also transclude tiddler field values using the [[filter syntax|Filter Syntax]]. For example:
```
{{{ [tag{TiddlerContainingMyTag}] }}}
```
! Variable/Macro Transclusion
Variables that were defined with parameter or variable substitution are referred to as "macros". The value of a variable/macro can be transcluded with the syntax:
```
<<myMacro param:"Value of parameter">>
```
As described in [[HTML in WikiText]], you can also transclude a variable as the value of an attribute of HTML elements and widgets. For example:
```
<$text text=<<myMacro>>/>
```
As described in [[Introduction to filter notation]], you can also transclude a variable as the value of a filter parameter using the [[filter syntax|Filter Syntax]]. For example:
```
{{{ [tag<myMacro>] }}}
```
! Textual Substitution
Textual substitution occurs when the value of a macro/variable is used. It is described in [[Substituted Attribute Values]] and [[substitute Operator]]
The key difference between substitution and transclusion is that substitution occurs before WikiText parsing. This means that you can use substitution to build ~WikiText constructions. Transclusions are processed independently, and cannot be combined with adjacent text to define ~WikiText constructions.