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Drew McLellan

Mat, microformats are designed to add additional semantics to HTML to help a document author communicate the meaning of the content when HTML’s own semantics are not expressive enough.

Therefore it makes not sense to add them with JavaScript – it’s totally the wrong layer. Whilst it’s true that some of these little utility parsers run in a browser and therefore have JavaScript available (in which case why touch the document at all, right?), most parsers won’t have JavaScript and a DOM to work with.

Google and Yahoo both have some pretty neat microformats-based search tools in development that you can play with and get an idea of how useful structured data really is.