perldoc XML::Twig says:
keep_encoding
This is a (slightly?) evil option: if the XML document is not UTF-8 encoded and you want to keep it that way, then setting keep_encoding will use the"Expat" original_string method for character, thus keeping the original encoding, as well as the original entities in the strings
s$$([},&%#}/&/]+}%&{})*;#$&&s&&$^X.($'^"%]=\&(|?*{%
+.+=%;.#_}\&"^"-+%*).}%:##%}={~=~:.")&e&&s""`$''`"e

In reply to Re: Hexadecimal Entity Problem in XML::Twig by Skeeve
in thread Hexadecimal Entity Problem in XML::Twig by Samy_rio

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