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There are a few tools available to help you generate microformatted code:
Validation Testing Tools
You can check how your markup will be parsed by using the php-mf2 tool. It will take markup and show you the JSON interpretation.
If you want to check markup as it is interpreted from your page you can check out the microformat-node tool. It will grab your page and show you all found microformats that are supported by the tool.