# File src/rexml/parsers/baseparser.rb, line 361
                        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|
                                        m=$1
                                        m = "0#{m}" if m[0] == ?x
                                        [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 )
                                                        end
                                                end
                                        end
                                        matches.each do |entity_reference|
                                                unless filter and filter.include?(entity_reference)
                                                        er = DEFAULT_ENTITIES[entity_reference]
                                                        rv.gsub!( er[0], er[2] ) if er
                                                end
                                        end
                                        rv.gsub!( /&/, '&' )
                                end
                                rv
                        end