XPath selection

Hello, members!

Suppose I have such structure:

<catalog>
    <group id="1" parent="0" name="Foo1">
        <group id="5" parent="1" name="Bar1"/>
        <group id="6" parent="1" name="Bar2"/>
    </group>
    <group id="2" parent="0" name="Foo2">
    </group>
    <group id="3" parent="0" name="Foo3">
    </group>
    <group id="4" parent="0" name="Foo4">
    </group>
</catalog>

I need to select name attribute of all elements group (they can have any
level of nest).
So, I select all that elements in a such way: catalog//group; but how can I
retrieve name attribute?
The construction catalog//@name does not work :-(
Thanks in advance.
__
Peter