def add_tag(name, start, stop)
      @attr_tags << InlineTag.new(SM::Attribute.bitmap_for(name), start, stop)
    end
def add_tag(name, start, stop)
      @attr_tags << InlineTag.new(SM::Attribute.bitmap_for(name), start, stop)
    end
Add a new set of HTML tags for an attribute. We allow
 separate start and end tags for flexibility