sample:
<metadata xmlns="http://musicbrainz.org/ns/mmd-1.0#" xmlns:ext="http://musicbrainz.org/ns/ext-1.0#">
<artist-list offset="0" count="1090">
<artist type="Group" id="e9aed5e5-ed35-4244-872e-194862290295" ext:score="100">
</artist>
</artist-list>
</metadata>
solution:
xml.child("artist-list");