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$ echo '<root></root>' | xmllint - -:1: parser error : xmlParseCharRef: invalid xmlChar value 14 <root></root> ^
$ perl -e'print "<root><![CDATA[\x{0e}]]></root>"' | xmllint - -:1: parser error : PCDATA invalid Char value 14 <root><![CDATA[]]></root> ^