About [[MediaWiki:Apihelp-sitematrix-description/en]]

I think your description is a lot clearer than the current message:

"The code is either the unique identifier for specials or, for languages, the project code."

Alternatively a combo such as:

"The code is either the language code + project code for content projects or the subdomain + main domain for all the others.
Lokal Profil (talk)‎08:45, 16 February 2015
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