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Custom Feed and Entry Classes - Zend_Feed
Finally, you can extend the Zend_Feed classes if you'd like to provide your own format or niceties like automatic handling of elements that should go into a custom namespace.
Here is an example of a custom Atom entry class that handles its own myns: namespace entries. Note that it also makes the registerNamespace() call for you, so the end user doesn't need to worry about namespaces at all.
Example #1 Extending the Atom Entry Class with Custom Namespaces
Then to use this class, you'd just instantiate it directly and set the myUpdated property: