class Fixnum


Enhance the Fixnum class with a XML escaped character conversion.
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def xchr(escape=true)

converted to character entities.
the CP1252 fix is still applied but utf-8 characters are not
XML escaped version of chr. When escape is set to false 
def xchr(escape=true)
  n = XChar::CP1252[self] || self
  case n when *XChar::VALID
    XChar::PREDEFINED[n] or 
      (n<128 ? n.chr : (escape ? "&##{n};" : [n].pack('U*')))
  else
    Builder::XChar::REPLACEMENT_CHAR
  end
end