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https://issues.apache.org/jira/browse/XERCESJ-1755?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17684288#comment-17684288
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Elliotte Rusty Harold commented on XERCESJ-1755:
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The user is wrong. It makes no sense to use U+FF0B as a namespace prefix or
almost anywhere else outside of typesetting. Honestly maybe not even there.
It's not clear to me this is truly a distinct character, and perhaps shouldn't
have been added to Unicode in the first place. Regardless though, it clearly
does not belong in markup, even were it allowed, and the user is making trouble
for themselves by trying to use it there. It's a good example of some developer
being way too impressed with their own cleverness and knowledge of technical
arcana. This should not have gotten past the first code review.
> Unicode character Fullwidth Plus Sign not allowed in attribute value (XML 1.0)
> ------------------------------------------------------------------------------
>
> Key: XERCESJ-1755
> URL: https://issues.apache.org/jira/browse/XERCESJ-1755
> Project: Xerces2-J
> Issue Type: Bug
> Reporter: Radu Coravu
> Priority: Minor
>
> Unicode character U+FF0B: Fullwidth Plus Sign not allowed in attribute value
> with XML 1.0 version.
> This XML fragment is reported by Xerces as invalid:
> {code}<?xml version="1.0"?>
> <abc xmlns:＋="https://iso20022.plus";></abc>{code}
> {quote}Element or attribute do not match QName production:
> QName::=(NCName':')?NCName.{quote}
> Although FF0B seems to fit in this range of allowed chars [#xE000-#xFFFD] for
> XML 1.0:
> https://www.w3.org/TR/REC-xml/#NT-Char
> If I change the XML version to 1.1 the validation starts working again.
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