DevOps, CI/CD and Automation

What is the syntax for getting the length or the number of child nodes?

For e.g. my xml is :-

v_userlist := XMLType('<?xml version="1.0"?>
    <users>
        <user>
            <name>user1</name>
        </user>
        <user>
            <name>user2</name>
        </user>
        <user>
            <name>user3</name>
        </user>
    </users>');

So the number of users = 3.

So what should I put to get the count of the child node user?