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: xml.rb
    path of file: ./repos/ruby-packer/ruby/lib/rss
    
    the code of the file until where you have to start completion: # frozen_string_literal: false
require_relative "utils"

module RSS
  module XML
    class Element
      include Enumerable

      attr_reader :name, :prefix, :uri, :attributes, :children
      def initialize(name, prefix
    
      def to_s
        rv = "<#{full_name}"
        attributes.each do |key, value|
          rv << " #{Utils.html_escape(key)}=\"#{Utils.html_escape(value)}\""
        end
        if children.empty?
          rv << "/>"
        else
          rv << ">"
          children.each do |child|
            rv << child.to_s
          end
          rv << "</#{full_name}>"
        end