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https://issues.apache.org/jira/browse/XERCESJ-1681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16078699#comment-16078699
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Elliotte Rusty Harold commented on XERCESJ-1681:
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This is a very subtle point. Your user is correct. You should not use the
element name xml-root, though the sky won't fall if you do.
However this is not an error that Xerces should report. Names like xml-root can
be defined by a future version of the XML specification, and they are not
malformed or inherently invalid. Thus, no error. At most it should report a
non-fatal warning.
> Report parse error when element names begin with "xml"
> ------------------------------------------------------
>
> Key: XERCESJ-1681
> URL: https://issues.apache.org/jira/browse/XERCESJ-1681
> Project: Xerces2-J
> Issue Type: Bug
> Components: SAX
> Reporter: Radu Coravu
>
> One of our users suggested us that an XML like this:
> {code:xml}
> <xml-root></xml-root>
> {code}
> is not valid because the specs:
> https://www.w3.org/TR/2006/REC-xml11-20060816/#sec-common-syn
> says that the name of an XML element should not start with XML:
> {code}
> A Name is a token beginning with a letter or one of a few punctuation
> characters, and continuing with letters, digits, hyphens, underscores,
> colons, or full stops, together known as name characters.] Names beginning
> with the string "xml", or with any string which would match (('X'|'x')
> ('M'|'m') ('L'|'l')), are reserved for standardization in this or future
> versions of this specification.
> {code}
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