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Remove invalid chars from displayed string per XML specification
Strict XHTML requires that data comply with XML 1.0 specification [1], which only allows a subset of the UTF-8 charset. Function string_html_specialchars() has been modified to remove from the string to print, any character which is not in the defined range Char ::= #x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF] Fixes #14744 [1] http://www.w3.org/TR/xml/
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