The PersonConstruct module is used to define a person Atom element that can be used to describe a person, corporation or similar entity.
The PersonConstruct has a Name, Uri and Email child elements.
Reference: validator.w3.org/feed/docs/rfc4287.html#atomPersonConstruct
Adds attributes for name, uri, and email to the klass
 
               # File rss/atom.rb, line 182
def self.append_features(klass)
  super
  klass.class_eval do
    [
     ["name", nil],
     ["uri", "?"],
     ["email", "?"],
    ].each do |tag, occurs|
      install_have_attribute_element(tag, URI, occurs, nil, :content)
    end
  end
end