Why are URLs in XML namespaces?

Question

Take this line as just one example:

Answer 1

W3 explanation Here

Just like namespaces in .NET, namespaces in XML documents are designed to help prevent and resolve name collisions, especially if XML documents are from different organizations and/or domains of knowledge.

XML document format has been stylized by the same people responsible for HTML, so you may find syntactical similarities in elements of the format. Semantically, the dotNET and XML namespaces serve the same goal.