Get information from namespace

[slolo2000]

Hello,

If a RSS feed contains elements with namespace (see below), what is the way to get informations like content:encoded or dc:xxx in JSON?

<?xml version="1.0" encoding="utf-8"?>
<rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:dc="http://purl.org/dc/elements/1.1/">
  <channel>
    <title>feed title</title>
    <image>
      <url>http://www.xxxxx.com/images/logo.gif?v1.0</url>
      <title>feed image title</title>
      <link>http://www.xxxxx.com/</link>
    </image>
    <link>http://www.xxxxx.com/</link>
    <description>feed description</description>
    <language>en-us</language>
    <dc:creator>feed creator</dc:creator>
    <item>
      <link>http://www.xxxxx.com/aaaa/test-1234567890</link>
      <guid>http://www.xxxxx.com/aaaa/test-1234567890</guid>
      <title>item title</title>
      <pubDate>Thu, 31 Aug 2017 00:00:00 GMT</pubDate>
      <dc:language>en-us</dc:language>
      <dc:creator>item creator</dc:creator>
      <description>item description</description>
      <content:encoded>
<![CDATA[<h2>Test content</h2>
<p><img src="http://www.xxxxx.com/img/img_1.png" alt="..." title="..."  style="float:left;margin:0 1em 1em 0;border:1px solid #000;" />
content ... content - <span style="color:#666">TEST</span><br /><strong style="color:#333">style test</strong>
</p>
<p style="clear:left">
<a href="http://www.xxxxx.com/aaa/bbb/test-1122334455666">More...</a>
</p>]]>
      </content:encoded>
    </item>
  </channel>
</rss>

Do you think you could add it to your PHP class?

Thanks in advance and have a nice day.