You still write a list like 1: it is well formed 2: the person who produces it will fix it when you tell them 3: the encoding is correct etc. Even ycombina

You still write a list like 1: it is well formed 2: the person who produces it will fix it when you tell them 3: the encoding is correct etc. Even ycombinator's rss feed is only well formed but not fully specified http://validator.w3.org/check?verbose=1&uri=https%3A%2F%2Fnews.ycombinator.com%2Frss http://validator.w3.org/check?verbose=1&uri=https%3A%2F%2Fne...