Who validates the validator?

The RSS Validator designed by Mark Pilgrim and Sam Ruby appears to be rejecting some valid RSS 2.0 files that make use of namespaces. As discovered by RasterWeb, when an RSS 2.0 feed contains core elements and namespace elements that serve the same purpose, such as and , the validator claims it does not validate. To fix the problem, it recommends that the core element be removed.

I can't find anything in the RSS 2.0 specification that would make duplicative elements invalid or recommend that a namespaced element be favored over a core element. We're investigating it further on the SSF-DEV mailing list.

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