Miva script and XSL, XML...

Hi,

I'm new to XML and just purchased Tennisons book.  It's my understanding
that Miva Script is
based upon XML and XSLT, is this correct?

I have been using Miva Merchant eCommerce for some time and thought learning
XML would be a good way
to start to learn how to customize my on line store, would this be a good
way to approach it?

Unfortunately I can only find one book about Miva script and I believe it is
out dated.

Thanks for any enlightenment on this subject anyone cares to share.

DS