Was reminded tonight that the Feed Validator is not in the business of validating RSS 1.0, something I had commented on before, but had forgotten. Remembered tonight when I noticed that the otherwise excellent RSS feeds from del.icio.us are declaring the same resource multiple times per feed (i.e. multiple items have the same rdf:resource/rdf:about aka item_uri).

Which should cause trouble for practically no one (XML::RSS, and Magpie are both fine with it just to kick out two data points), and it is understandable to produce such a feed as many toolkits (earlier versions of XML::RSS, and the current version of RSSWriter for example) don’t provide a syntax for giving an item a distinct link and item_uri. But the Feed Validator should at least mention it.