Validity of "ascii" encoding?

I was working on a document that begins

   <?xml version='1.0' encoding='ascii'?>

, only to discover that nXML regards this as an "unsupported 
encoding", rendering the document invalid.

I admit to not understanding why ascii should be unsupported
if UTF-8 is OK, nor understanding what encodings a parser is
supposed, or required, to support according to the XML
specification. So let me skip this, assuming that there is a
real reason for it, and just ask the bottom-line question: is
there anything I can do in my .emacs to get nXML to accept
'ascii' as a valid encoding?

Thanks.

Jesse Sheidlower


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