How to store and retrieve objects using XML?

Question

I have a class called Word with these four attributes: text, caseSensitive, matchSimilar and relevance.

I have 10 categories for these words: (allowDetermining,allowHigh,...,denyDetermining,denyHigh,etc.).

I want to be able to store new words on each categories or retrieve all words from some category. How can I do this.

I think the XML structure should be like this, but I don't know if I'm right:

<allowDetermining>
    <word>
        <text>Renato</text>
        <caseSensitive>true</caseSensitive>
        <matchSimilar>false</matchSimilar>
        <relevance>0.75</relevance>
     </word>
</allowDetermining>
<allowHigh>
    ...
</allowHigh>
...

At the moment, I'm using the XMLConfiguration class from Apache Commons Configuration. Any idea of how do this using it? And with another library?