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Re: [xml-dev] Is it a well-formedness error to use a character not in the encoding specified by the XML declaration?

Is a substitution character (x'1a' in many single byte character sets or 65533 in UTF-8) a legal character?  I have a case where x'1a' appears not be to legal in a document with an encoding specified as ISO-8859-1. 

On Fri, Mar 19, 2010 at 6:01 AM, Michael Kay <mike@saxonica.com> wrote:
It's not well-formed.

From the XML 1.0 spec [1]:
"It is a fatal error if an XML entity is determined (via default, encoding declaration, or higher-level protocol) to be in a certain encoding but contains byte sequences that are not legal in that encoding."

Unless of course there is a "higher-level protocol" that tells you it's really a different encoding. (The term higher-level protocol is not really defined. I think they had in mind the media-type from the HTTP content header. In terms of the protocol stack, that of course is a lower-level protocol. But it's sufficiently woolly that a phone call from the sender to say "Oops, I meant EBCDIC" would be enough to make the document well-formed.


Michael Kay


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