Template:Category handler/numbered/doc

Description
This is the category handler/numbered sub-template.

Do not use this template directly, use category handler instead. This template is called from category handler, see user documentation there.

The rest of the sections here are only for those that want to understand the internal workings of this template.

Technical details
This sub-template makes it possible for its parent-template to take input in two forms:

This sub-template takes a bunch of numbered parameters. There's no limit to the number of parameters it can use, other than what the servers and MediaWiki system can handle.

It also takes a parameter named data. If data is a number, then it returns the data of the corresponding numbered parameter. If data is something else, for instance a category name, then it returns data unchanged.

Here's how you would normally call this sub-template:

In the above example, since the parent-template feeds only 1-4, then only the numbers 1-4 will work properly. Feeding other numbers will return an empty string.