# File lib/rss/maker/feed.rb, line 282
282:                 def to_feed(feed, current)
283:                   icon = current.class::Icon.new
284:                   class << icon
285:                     alias_method(:url=, :content=)
286:                   end
287:                   set = setup_values(icon)
288:                   class << icon
289:                     remove_method(:url=)
290:                   end
291:                   if set
292:                     current.icon = icon
293:                     set_parent(icon, current)
294:                     setup_other_elements(feed, icon)
295:                   elsif variable_is_set?
296:                     raise NotSetError.new("maker.item.source.icon",
297:                                           not_set_required_variables)
298:                   end
299:                 end

     # File lib/rss/maker/feed.rb, line 302
302:                 def required_variable_names
303:                   %w(url)
304:                 end