Um, to be honest, I don't know! How could I tell? If we don't then I'm sure they can be enabled. [
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I have no idea; I've never been admin for a wiki before. From what I've read at the Traxus Project, I'm pretty sure it's an add-in module for Mediawiki. Evidently MW is extensible that way. IMO, includeonly/noinclude blocks and ParserFunctions are the two most valuable add-ons we use, to start with. Creating useful (i.e. anything beyond simple boilerplate text) templates is hobbled without them.
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