You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: notationdecl.rb
    path of file: ./repos/truffleruby/lib/gems/gems/rexml-3.2.5/lib/rexml/dtd
    
    the code of the file until where you have to start completion: # frozen_string_literal: false
require_relative "../child"
module REXML
  module DTD
    class NotationDecl < Child
      START = "<!NOTATION"
    
    
      def initialize src
        super()
        if src.match( PUBLIC )
          md = src.match( PUBLIC, true )
        elsif src.match( SYSTEM )
          md = src.match( SYSTEM, true )
        else
          raise ParseException.new( "error parsing notation: no matching pattern", src )
        end