# File lib/amrita/tag.rb, line 70
      def initialize(tagname, pptype=3)
        @pptype = pptype
        @url_attributes = nil
        @can_be_empty = false
        @tag_class = nil
      end

# File lib/amrita/tag.rb, line 77
      def freeze
        @pptype.freeze

        @url_attributes.freeze
        @can_be_empty.freeze
        super
        self
      end

# File lib/amrita/tag.rb, line 86
      def set_url_attr(*names)
        @url_attributes ||= {}
        names.each do |n|
          @url_attributes[n] = true
        end
      end

# File lib/amrita/tag.rb, line 94
      def url_attr?(attr_name)
        return false unless @url_attributes
        case attr_name
        when nil 
          return false
        when Symbol
        when String
          attr_name = attr_name.intern
        else
          attr_name = attr_name.to_s.intern
        end
        @url_attributes[attr_name]
      end