unnormalize

# File lib/rexml/parsers/baseparser.rb, line 473
      def unnormalize( string, entities=nil, filter=nil )
        rv = string.clone
        rv.gsub!( /\r\n?/, "\n" )
        matches = rv.scan( REFERENCE_RE )
        return rv if matches.size == 0
        rv.gsub!( /&#0*((?:\d+)|(?:x[a-fA-F0-9]+));/ ) {
          m=$1
          m = "0#{m}" if m[0] == xx
          [Integer(m)].pack('U*')
        }
        matches.collect!{|x|x[0]}.compact!
        if matches.size > 0
          matches.each do |entity_reference|
            unless filter and filter.include?(entity_reference)
              entity_value = entity( entity_reference, entities )
              if entity_value
                re = /&#{entity_reference};/
                rv.gsub!( re, entity_value )
              else
                er = DEFAULT_ENTITIES[entity_reference]
                rv.gsub!( er[0], er[2] ) if er
              end
            end
          end
          rv.gsub!( /&/, '&' )
        end
        rv
      end