One of the things that JotSpot opened my eyes to was the possibilities of backing wikis with a structured data repositories. Jeff Young wrote to point me at a project he's working on called WikiD, a "project (originally called MetaWiki) [that] leverages open standards, open source software, and existing resources to extend the Wiki model to support the creation and maintenance of structured data." There's a demo site if you'd like to play around with it.
WikiD: Structured Data and Wikis
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