simple xml generation

xml_me.rb

  def xml
    @xml_string << "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
  end

  def tag(tag, attrs={}, &block)
    @xml_string << "<#{tag}"
    text = attrs.delete(:text)
    @xml_string << " " if not attrs.empty?
    attrs.each_pair do |key, value|
      @xml_string << "#{key.to_s}=\"#{value.to_s}\""
      @xml_string << " " if key != attrs.keys.last
    end
    @xml_string << ">"
    if block_given?
      block.arity < 1 ? self.instance_eval(&block) : block.call(self)
    end
    @xml_string << text.to_s.gsub(/[&"'<>]/) {|match| REPLACEMENTS[match]} if text
    @xml_string << "</#{tag}>"
  end