XML : Why is there a URL in the Doctype of XML Code, and what is it used for?

As I have been looking into source codes for websites that code in XML, why is there a webiste referenced?

In this case,

http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd

Is stated. Why is that, and If I were to have access to that file, or website what would be inside it?

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