caption: transclusion
created: 20141002004621385
modified: 20141002162057822
tags: Variables
title: WidgetVariable: transclusion
type: text/vnd.tiddlywiki

! Mechanism 
The ''transclusion'' variable is set automatically by the transclude widget to contain a string that identifies the position of the current node within the widget tree. In the sidebar it is set to `{|$:/core/ui/PageTemplate/sidebar|||}` and within the tiddler "HelloThere" in the story river it is set to `{HelloThere|HelloThere|||}`. Each nested level of transclusion appends another curly bracketed list of symbols.

The QualifyMacro uses the ''transclusion'' variable to identify the stack of transcluded tiddlers.

! Example

```
\define mymacro()
Hello from mymacro
<$list filter="[<transclusion>prefix[{|$:/core/ui/PageTemplate/sidebar|||}]]" emptyMessage="in a tiddler">
	in the sidebar
</$list>
\end

<<mymacro>>
```

Result in story tiddler

```
Hello from mymacro in a tiddler
```

Result in the sidebar

```
Hello from mymacro in the sidebar
```