normalize (REXML::Text)

    # File rexml/text.rb, line 177
      def Text::normalize( input, doctype=nil )
    			copy = input.clone
    			# Doing it like this rather than in a loop improves the speed
    			if doctype
    				copy.gsub!( EREFERENCE, '&amp;' )
    				doctype.entities.each_value do |entity|
    					copy.gsub!( entity.value, "&#{entity.name};" ) if entity.value
    				end
    			else
    				copy.gsub!( EREFERENCE, '&amp;' )
    				DocType::DEFAULT_ENTITIES.each_value do |entity|
    					copy.gsub!(entity.value, "&#{entity.name};" )
    				end
    			end
    			copy
    		end