Supported XML Namespaces

SimplePie 1.0 introduces four new methods for getting data from ANY element or attribute in the feed: get_channel_tags(), get_feed_tags(), get_image_tags(), and get_item_tags().

These are the methods that SimplePie uses internally, and they rely on the use of namespace URLs to find these elements. Because a number of these namespace URLs are used frequently by SimplePie, we've set up the following constants to make namespace stuff simpler. If you want to gain access to a namespaced element that isn't on this list, you can manually type (or copy-paste) the namespace URL.