# File lib/rss/image.rb, line 20
20:     def validate_one_tag_name(ignore_unknown_element, name, tags)
21:       if !ignore_unknown_element
22:         invalid = tags.find {|tag| tag != name}
23:         raise UnknownTagError.new(invalid, IMAGE_URI) if invalid
24:       end
25:       raise TooMuchTagError.new(name, tag_name) if tags.size > 1
26:     end