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This is the ((main other)) meta-template.
This template helps other templates detect if they are on a main space (article) page or some "other" type of page.
This template usually takes two parameters, like this:
((main other |result if in mainspace |result if elsewhere))
If the template is on a main space (article) page, it will return this:
If the template is on any other page, it will return this:
A typical usage case could be to make it so that a template only adds a category when on an article. Thus not adding other pages that just show the template. Like this:
Note that guidelines do not support categorization in templates.
Or to warn that a template should not be used on other pages:
Note that in the first case above the "other" parameter was not used, and in the second example the "main" parameter was left empty.
For testing and demonstration purposes, this template can take a parameter named demospace.
Like this:
No matter on what kind of page the code above is used, it will return: result if in mainspace
You can make it so your template also understands the demospace parameter. That means you can demonstrate the different appearances of your template in the documentation for your template:
This template detects article "Talk:" pages as type other.
This template works like ((main talk other)). For more examples and technical details, see the documentation there.