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Simple List Questions

I’m looking into adding FeedValidator support for Microsoft’s Simple List Extensions Specification, and have a few questions:

Answers to these questions, as well as identification of other areas of potential confusion, would be appreciated.

Should there be errors or warnings issued for any of these conditions?

Update: Added question on embedded HTML.

Update: There is now a proposed revision and a wiki page.

Update: Added question on multiple <cf:listinfo> elements.