Select children based on attributes?

[twoeyedhuman]

I'm writing a simple program that selects user data based on attributes so I can learn more about programming.

My problem is selecting children based on attributes.  Take this example:

<?xml version="1.0" standalone=no>
<user attribute="1234">
    <data>ect.</data>
</user>

<user attribute="5678">
    <data>example data</data>
</user>

I want to be able to select a <user> based on what the attribute equals.  Anyone know how to do this?

[twoeyedhuman]

EDIT LAST MESSAGE:

After looking for the forums again for an answer, I realized that there can only be one root node.

The example should look like this:
<!xml version="1.0" standalone=no>
<root>

<user attribute="1234">
<data>ect.</data>
</user>

<user attribute="5678">
<data>example data</data>
</user>

</root>

[flamingheart]

I think you can traverse all the nodes and check if the attribute of it equals to the attribute you designate.

[twoeyedhuman]

Ahhh... Good idea - I'll do that, thank you.