This week XML is ten years old. The core XML 1.0 specification was released in February 1998.
It's a nice anniversary to have.
The XML + Namespaces specification has a built in namespace declaration of http://www.w3.org/XML/1998/namespace. That's an implicit namespace declaration, a special one, governing all other. One namespace declaration to rule them all. Bound to xml: prefix.
XML was born and published as a W3C Recommendation on 10th of February 1998.
So, well done XML. You did a lot for IT industry in the past decade.