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Item 5 of Appendix F refers to section 2.9 Error Handling for the handling of serialization errors. This in turn refers to section 20 Serialization, which in turn refers back to section 2.9 Error Handling. As a result, I have no idea what is required for the documentation of this particular implementation-defined behaviour.
I think this is essentially a duplicate of 2469 http://www.w3.org/Bugs/Public/show_bug.cgi?id=2469 Michael Kay
Yes. I agree. So I'm closing it as such. *** This bug has been marked as a duplicate of 2469 ***