Oracle Pl/SQL: Loop through XMLTYPE nodes

I have a XMLTYPE with the following content:

<?xml version="1.0"?>
    <users>
        <user>
            <name>user1</name>
        </user>
        <user>
            <name>user2</name>
        </user>
        <user>
            <name>user3</name>
        </user>
    </users>

How can I loop in PL/SQL through all the elements "user"? Thanks