This is the{{Namespace detect}} meta-template. It helps other templates detect what type of page they are on.
It detects and groups all the differentnamespaces used on Wikipedia into several types:
main
Main (i.e. article) space, where normal Wikipedia articles are kept.
talk
Any talk space, including page names that start with "Talk:", "User talk:", "File talk:", etc.
portal
category
user
draft
wikipedia
mediawiki
book
timedtext
template
special
media
file
help
module
The remaining namespaces.
other
Any namespaces that were not specified as a parameter to the template (see explanation below).
For backwards compatibility, this template handlesimage as iffile.image ([[Image:...]]) is now deprecated.
Note: For most cases it may be better to use the simpler namespace detection templates (see thesee also section below). This template is more prone to human errors such as misspelling parameter names.
Usage
This template takes one or more parameters named after the different page types as listed above. Like this:
{{Namespace detect | main = Article text | talk = Talk page text | other = Other pages text}}
If the template is on a main (article) page, it will return this:
Article text
If the template is on any other page than an article or a talk page, it will return this:
Other pages text
The example above made the template return something for all page types. But if we don't use theother parameter or leave it empty, it will not return anything for the other page types. Like this:
{{Namespace detect | file = File page text | category = Category page text | other =}}
On any pages other than file and category pages the code above will render nothing.
By using an empty parameter, you can make it so the template doesn't render anything for some specific page type. Like this:
{{Namespace detect | main = | other = Other pages text}}
The code above will render nothing when on mainspace (article) pages, but will return this when on other pages:
Other pages text
Demospace and page
For testing and demonstration purposes, this template can take two parameters nameddemospace andpage.
demospace understands any of the page type names used by this template, including theother type. It tells the template to behave like it is on some specific type of page. Like this:
{{Namespace detect | main = Article text | other = Other pages text | demospace = main}}
No matter on what kind of page the code above is used, it will return this:
Article text
Thepage parameter instead takes a normal pagename, making this template behave exactly as if on that page. The pagename doesn't have to be an existing page. Like this:
{{Namespace detect | user = User page text | other = Other pages text | page = User:Example}}
No matter on what kind of page the code above is used, it will return this:
User page text
It can be convenient to let your template understand thedemospace and/orpage parameter and send it on to the{{Namespace detect}} template. Like this:
{{Namespace detect | main = Article text | other = Other pages text | demospace = {{{demospace|}}} | page = {{{page|}}}}}
If both thedemospace andpage parameters are empty or undefined, the template will detect page types as usual.
Parameters
List of all parameters:
{{Namespace detect| main = ...| other =| demospace = {{{demospace|}}} / main / talk / user / wikipedia / file / mediawiki / template / help / category / portal / other| page = {{{page|}}} / User:Example}}
Note: Empty values to the "main" ... "other" parameters have special meaning.
Technical details
Namespace "Image" was renamed to "File" on 11 December 2008. This template was updated to understand both names well before that, thus it still works fine. For backwards compatibility it still understands "image" both as a parameter name, such as "image = File page text", and as a value "demospace = image".
If you intend to feed tables as content to the numbered parameters of this template, you need to know this:
Templates have a problem handling parameter data that contains pipes "|" unless the pipe is inside another template{{name|param1}} or inside a piped link[[Help:Template|help]]. Thus templates can not handlewikitables as input unless you escape them by using the{{!}} template. This makes it hard to use wikitables as parameters to templates. Instead, the usual solution is to use "HTML wikimarkup" for the table code, which is more robust.
For more technical details, e.g. about copying this template to other projects and CSS-based namespace detection, see{{Main talk other}} and its talk page.
