Editing Help:Interwiki linking (section)

=== Doubling prefixes ===
{{further|#Interlanguage interwiki links|topic=foreign-language prefixes}}
{{further|Wikipedia:Tip of the day/August 23, 2008|topic=the category prefix}}
As demonstrated in [[Help:Interwiki linking#Examples of link combinations|the examples below]], combinations of certain prefixes are allowed, thus enabling direct page links that are not possible with a single prefix. For example, by combining two prefixes, one can link a word in the English Wikipedia to a term in the German Wiktionary, or link to a category in the Commons.

When using language codes, the order of the prefixes does not matter. Remember to put a colon in front of a link starting with a language prefix; however, the colon is optional if the link starts with the project code prefix and then has the language prefix. See the last two examples in [[Help:Interwiki linking#Examples of link combinations|the table below]].

When using the category prefix, the order of the prefixes ''does'' matter. The order must be <code><nowiki>[[project:category:category-name]]</nowiki></code>. Starting with a colon and the prefix <code>category</code> [[Wikipedia:Manual of Style/Linking#Links to Wikipedia's categories|links to categories on this Wikipedia]], creating a red link if the category doesn't exist. Without the colon but starting with the prefix <code>category</code>, nothing appears in the saved page.