61 lines
2.1 KiB
Plaintext
61 lines
2.1 KiB
Plaintext
created: 20141018090608643
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modified: 20231030124224424
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tags: WikiText
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title: Transclusion and Substitution
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type: text/vnd.tiddlywiki
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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.
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The main distinction is between a transclusion and a textual substitution:
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* A transclusion is replaced dynamically with the value of either:
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** a tiddler field
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** a variable
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* Textual substitutions are performed on the text of macro definitions before they are used
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! Tiddler Field Transclusion
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[[Transclusion in WikiText]] describes the basics of transclusion. For example:
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```
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{{MyTiddler}}
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```
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As described in [[HTML in WikiText]], you can also transclude tiddler field values as attributes of HTML elements and widgets. For example:
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```
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<$text text={{MyTiddler}}/>
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```
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As described in [[Introduction to filter notation]], you can also transclude tiddler field values as filter operands. For example:
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```
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{{{ [tag{TiddlerContainingMyTag}] }}}
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```
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! Variable/Macro Transclusion
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Variables that were defined with parameter or variable substitution are referred to as "macros". The value of a variable/macro can be transcluded with the syntax:
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```
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<<myMacro param:"Value of parameter">>
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```
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As described in [[HTML in WikiText]], you can also transclude a variable as the value of an attribute of HTML elements and widgets. For example:
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```
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<$text text=<<myMacro>>/>
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```
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As described in [[Introduction to filter notation]], you can also transclude a variable as the value of a filter operand. For example:
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```
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{{{ [tag<myMacro>] }}}
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```
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! Textual Substitution
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Textual substitution occurs when the value of a macro/variable is used. It is described in [[Substituted Attribute Values]] and [[substitute Operator]]
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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.
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