Use advanced xml white on android

i have a xml file like:

<xml>
    <userlist sub='A'>
        <user id='1'>Daan</user>
        <user id='2'>Maarten</user>
        <user id='3'>Wannes</user>
        <user id='4'>Kobe</user>
        ...
    </userlist>
    <userlist sub='B'>
        <user id='5'>Fien</user>
        <user id='6'>Lisa</user>
        <user id='7'>Charlot</user>
        <user id='8'>Agnes</user>
        ...
    </userlist>
    <userdata>
        <userd id='1'>
            <phone>0123498519</phone>
            <genre>M</genre>
            ...
        </userd>
        <userd id='2'>
            <phone>0123958519</phone>
            <genre>M</genre>
            ...
        </userd>
        <userd id='3'>
            <phone>0143488569</phone>
            <genre>M</genre>
            ...
        </userd>
        ...
    </userdata>
</xml>

Now i use this code to get my list of users

DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder(); 
Document XmlCode = documentBuilder.parse(database);
XmlCode.getDocumentElement().normalize();
NodeList nodeList = XmlCode.getElementsByTagName("userlist");

But now i get all the "" elements, how can i select only the "" where sub is 'A'?

And how can i select for example the phone number of of the user with id '3'?

I have found the same question on stackoverflow, but no solutions.

Greatings