May be the following conversion will satisfy you 

$xml_native =~ s/([^\w\s])/'&#'.ord($1).';'/ge;

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In reply to Re: How to convert <,&,>,",' into XML &lt;,&amp;,&gt;,&quot .. by ccn
in thread How to convert <,&,>,",' into XML &lt;,&amp;,&gt;,&quot .. by gasho

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