Working with xml namespaces

Add a namespace to the document

$xml->addNamespace('my', 'http://www.example.com/mytest/');

will produce

<?xml version="1.0" encoding="utf-8"?>
<root xmlns:my="http://www.example.com/mytest/"> 
    ...
</root>

Add a node with a namespace prefix

$xml->appendChild('my:othernodens', 'teste');

Add a node with a namespace

$xml->appendChild('nodens', 'teste', 'http://www.example.com/mytest/');