Set whether the parser should allow certain errors for
compatibility with earlier versions. version can be:
"7.2"
Allow more data after the root element.
"7.6"
Allow multiple and invalidly placed "<?xml ... ?>" and
"<!DOCTYPE ... >" declarations (invalid "<?xml ... ?>"
declarations are otherwise treated as normal PI:s). Allow
"<![CDATA[ ... ]]>" outside the root element. Allow the root
element to be absent.
version can also be zero to enable all error checks.
Parser.XML.Simple()->allow_rxml_entities()