SEO Expert:

I was trying to make an xml site map for my client but before creating it I want to gain some knowledge of XML. So I have started searching information about XML.
So, what exactly XML is?
It’s neither semantics (Set of rules) nor a set of tags then what xml means. It means XML is a meta-language to describe markup languages.

• XML provide a facility to define tags
• XML provides a structural relationships between tags.

The semantics of an XML document can be defined on the applications that process then or on the stylesheets.