That depends on where your content is coming from. If it's external to your wiki, you probably need a bot. You can find info about them here:
http://www.mediawiki.org/wiki/Manual:Bots
Basically, they interact with MediaWiki via the API:
http://www.mediawiki.org/wiki/API:Main_page
You can use the API to code up something to do simple things that doesn't require full bot capability. I have done neither myself, so I can't say which approach is better for your needs.
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