Difference between XML and XMI?

Question

Can some one shed some light on the difference between XML and XMI? Can XMI be used in place of XML?

Answer 1

An XMI document is an XML document. An XML document is not necessarily an XMI document.

This is an XML document:

   myContent 

but it is not an XMI document.

XMI is a specific XML dialect. It consists of a specific set of tags with specific syntax and semantics aimed at describing a model.