intertwingly

I've been trying for days to subscribe to Ted Leung's RSS feed using Radio's aggregator. What I have been getting is:

Can't subscribe to the channel. The most likely cure is to check the URL in a web browser and see if you can get it to read the feed. The following message probably won't help you figure out what went wrong, but we include it here because it might. "Assignment over existing table object "s" is not allowed. Delete the object first, or use table.assign to override protection."

After some experimentation, I tracked the problem down to the lines of the following form:

<category domain="http://www.sauria.com"> culture/film </category>

Delete the domain, and Radio is happy. Yet, as near as I can tell, these elements conform to the RSS 2.0 specification, hence the feed validates.