Different wikis often have different metadata formatting conventions because it's just wikitext. How do the tracking categories know where to find the information?

Deryck
>
> On 7 Oct 2014 00:03, "Gergo Tisza" <gtisza@wikimedia.org> wrote:
>>
>> Hi all,
>>
>> starting this Tuesday (on Commons) or Thursday (all other wikis), files which do not have machine-parseable author, source, license or description will be automatically added to tracking categories (one category for each). The name of the categories will be determined by the following messages:
>>
>> commonsmetadata-trackingcategory-no-license
>> commonsmetadata-trackingcategory-no-description
>> commonsmetadata-trackingcategory-no-author
>> commonsmetadata-trackingcategory-no-source
>>
>> Translatewiki link: https://translatewiki.net/w/i.php?title=Special:Translate&group=ext-commonsmetadata
>>
>> If you would rather not have these tracking categories on your wiki, you can achieve that by setting the content of the local message to "-" (a single dash character).
>>
>> Links to the local message pages are available from [[Special:TrackingCategories]].
>>
>>
>> _______________________________________________
>> Wikitech-ambassadors mailing list
>> Wikitech-ambassadors@lists.wikimedia.org
>> https://lists.wikimedia.org/mailman/listinfo/wikitech-ambassadors
>>