'Incorrect display of xml file sitemap in browsers(php)

Create sitemap on php language. If don't add element xmlns:xhtml="http://www.w3.org/1999/xhtml" in urlset and xhtml:link after , sitemap is displayed correctly. But If I add a tag xhtml:link, I get the page display as text

My Content-Type in headers application/xml

Exemple image

Have any ideas as resolve this problem?



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