Defines the top-level element of an Atom Feed Document. It consists of a number of children Entry elements, and has the following attributes:
author
categories
category
content
contributor
entries (aliased as items)
entry
generator
icon
id
link
logo
rights
subtitle
title
updated
Reference: validator.w3.org/feed/docs/rfc4287.html#element.feed
Creates a new Atom feed
# File rss/atom.rb, line 313 def initialize(version=nil, encoding=nil, standalone=nil) super("1.0", version, encoding, standalone) @feed_type = "atom" @feed_subtype = "feed" end