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Modifying Feed and Entry structures - Zend_Feed
Zend_Feed's natural syntax extends to constructing and modifying feeds and entries as well as reading them. You can easily turn your new or modified objects back into well-formed XML for saving to a file or sending to a server.
Example #1 Modifying an Existing Feed Entry
This will output a full (includes <?xml ... > prologue) XML representation of the new entry, including any necessary XML namespaces.
Note that the above will work even if the existing entry does not already have an author tag. You can use as many levels of -> access as you like before getting to an assignment; all of the intervening levels will be created for you automatically if necessary.
If you want to use a namespace other than atom:, rss:, or osrss: in your entry, you need to register the namespace with Zend_Feed using Zend_Feed::registerNamespace(). When you are modifying an existing element, it will always maintain its original namespace. When adding a new element, it will go into the default namespace if you do not explicitly specify another namespace.
Example #2 Creating an Atom Entry with Elements of Custom Namespaces