Transclusion

Transclusion is the process of including the content of one page (usually a template) into another page. It helps reuse text, standardize layouts, and maintain consistency across many pages.

Basics

To transclude a template, use double curly braces:

{{Template name}}

To transclude a regular page (not in Template: namespace), use:

{{:Page name}}

 The leading colon (:) is required for transcluding pages outside the Template namespace.

You can add parameters:

{{Template name|param1=value|param2=value}}

Where it works

Works in most content pages: articles, project pages, user pages.
Also works in talk pages and documentation pages.
Transclusion inside tables, lists, and infoboxes is supported.
Some namespaces may restrict certain features depending on local configuration.

Parameters

Parameters allow templates and transcluded pages to be customized.

Positional parameters:

{{Example|alpha|beta}}

 Mapped in the template to {{{1}}}, {{{2}}}, etc.

Named parameters:

{{Example|color=blue|size=large}}

 Accessed via {{{color}}} and {{{size}}}.

Defaults:

{{{color|red}}}

 Uses red if color is not provided.

Aliases:

{{{colour|{{{color|}}}}}}

 Accept either spelling, preferring colour, then color.

Transcluding pages

From Template namespace:

{{Infobox person}}

From other namespaces:

{{:Help:Editing}}

From subpages:

{{:Wikipedia:Sandbox/Subpage}}

Avoid transcluding user pages into articles unless clearly necessary and policy-compliant.

Preventing transclusion

Noinclude:

 Content inside <noinclude>…</noinclude> is visible only on the template page, not on pages that transclude it (commonly used for documentation and categories).

Includeonly:

 Content inside <includeonly>…</includeonly> appears only when the template is transcluded, not on its own page.

Onlyinclude:

 Content inside <onlyinclude>…</onlyinclude> is the only part transcluded; the rest is ignored.

Example:

  Template page:
  Intro text
  <noinclude>Docs and categories here.</noinclude>

Linking vs transcluding

Link to a template page:

{{tl|Template name}}

 This shows the link without transcluding the template.

Link to a page instead of transcluding:

[[:Page name]]

 The leading colon prevents category additions or unintended behaviors.

Conditional logic

Templates can adjust output based on parameters:

Basic if/else (ParserFunctions):

{{#if:{{{title|}}}|Has title: {{{title}}}|No title provided}}

Switch:

{{#switch:{{{status|}}}
   |yes=Enabled
   |no=Disabled
   |#default=Unknown
  }}

See Help:ParserFunctions for more.

Transclusion and categories

Categories in a template will categorize any page that transcludes it.
To avoid categorizing the template page itself, place categories inside on the template.
To categorize only the /doc page, put categories in the /doc subpage (which is normally d).

Nesting and recursion

Templates can transclude other templates (nesting).
Avoid deep recursion and circular transclusion, which can cause errors or performance issues.
Check the Special:ExpandTemplates tool to debug complex nesting.

Performance considerations

Heavy templates (infoboxes, citation systems) may be transcluded on thousands of pages.
Minimize expensive parser functions and deep nesting.
Cache: MediaWiki caches parsed output; changes may take time to propagate.
Purge a page to refresh: click “Purge” or add ?action=purge to the URL.

Internationalization

Provide language-neutral parameters when possible.
For multilingual output, consider separate templates or Lua modules.
Document fallback rules on the template’s /doc page.

Lua (Scribunto)

Some templates use Lua modules for logic.
Transclusion syntax is the same; parameters are passed through to the module.
See Wikipedia:Lua and Help:Lua.

Common mistakes

Forgetting the leading colon when transcluding a non-template page (should be A page can be different things:



Usually, the page is the physical sheet of paper in the book, magazine, newspaper etc. When the page is not in the book (etc.) it is the sheet or piece of paper.

When we talk about computers, the page is also the common aabreviation in net jargon for "webpage".  Here the page is not paper, it is the piece of information which we can see on the computer monitor at one time.  We can print it to make the real page.  But the information may not fit all on one page, and we can not change it when it is printed - we can change the web page.  So the webpage is not always the same even as the printed copy of that page.  This is the conceptual metaphor.  It can be confusing.  Someone who uses it is also likely to use other jargon.

A page is also the boy or the young man who helps carry things and does small jobs for someone. Another word for this is the pageboy.

To page someone is to contact that person on air pager: this is the small electronic machine which makes the sound or gives someone the message.

guided tour test
guided tour test
guided tour test 

https://test2.wikipedia.org/wiki/O










Get Help!






Welcome to Wikipedia!



The article that you're looking for doesn't currently exist.

Before you create an article, you should read Wikipedia:Your first article.

Need help? You can ask a question at the Teahouse or through live chat.










There are different ways to edit Wikipedia:










Sandbox
Ready to try editing? You can experiment in your own sandbox to get a feel for editing Wikipedia. This is a great place to start without affecting live articles.Start editing 





 








Improve
  Wikipedia needs your help. Pick small editing tasks from a list, such as fixing spelling and grammar. Learn by making improvements to existing articles.Start helping 





 








Article Wizard 
 If you already have experience with editing, you can use our article wizard to create new articles. In just a few steps, you'll be on your way to contributing to Wikipedia.Start creating

).

Categorizing articles unintentionally via a template.
Using ambiguous parameter names without documentation.
Overloading templates with complex logic that belongs in Lua.

Examples

Minimal:

{{Template:Hello}}

With parameters:

{{Hello|name=World|bold=yes}}

Transcluding a help page:

{{:Help:Formatting}}

Tools

Special:ExpandTemplates — test and debug template expansion.
Special:WhatLinksHere/Template:Name — find transclusions.
— track usage (if set up).

Help:Transclusion