RecentChanges is (besides RandomPages) the only page on Wiki that is updated automatically by the server.  (Actually, that might also be the case with QuickChanges, but I don't completely understand that page as of yet).  

''Why should RecentChanges be an exception? Why don't we have a scripting language so we can make pages like RecentChanges for ourselves, instead of having only one page that is favored by the server?''

Any time you EditText on a page, a notification that this happened is added to RecentChanges.  If RecentChanges already includes a notification (about the same page), the older notification is deleted.

Note that RecentChanges is not a database query of some sort: it is just like any other WikiPage, editable and textual.  It's just that the server takes an interest in adding to the end of it (and in deleting redundant lines).

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CategoryWiki CategoryDefinition