Access into a tag in xml with python

I'm trying to get the information of this tag:

<movie:actor rdf:resource="http://data.linkedmdb.org/resource/actor/32439"/>

I need the final numbers (32439) but if i get the url I will be happy too.

I know how to get, for example, this information between this tags:

<dc:title>Eragon</dc:title>

with

Title=catalogo.getElementsByTagName("dc:title")[0]
print Title.childNodes[0].data

But i can't do the same with the other one,

Thanks for your help!