Pulling specific data from XML

Does anyone know of any tutorials/movies, or can offer some help with pulling specific data from XML? This is what I mean…

Supposed I have an XML file like this:

 <data> 
 
<article>
<ID>1a</ID>
<related items>
<item>3b</item>
<item>5f</item>
</related items>
</article>
 
 
<article>
<ID>3b</ID>
<related items>
<item>1a</item>
<item>5f</item>
</related items>
</article>
 
<article>
<ID>4e</ID>
<related items>
<item>6t</item>
<item>2w</item>
</related items>
</article>
 
</data>

Now, in Flash I want to load all items that have “5f” listed as one of their related item. So only display articles where item = 5f

If you know of any tutorials/movies that offer help with something like this, please let me know!

thanx