The Views XML Backend module allows data from XML documents to be rendered in Drupal views. It uses XPath queries to select rows and fields from XML data. Given
<rss>
<channel>
<item/>
</channel>
</rss>
the XPath query to get all the items within a channel would be /rss/channel/item.
However, if an XML document contains a default namespace, the element names will not work by themselves. Given
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<url/>
</urlset>
the XPath query to get all urls would be /*[local-name()='urlset']/*[local-name()='url'].