Cannot create a new xml file

Hi,

I've downloaded the trial version of Framemaker 12 to try it out with DITA documents, but I can't seem to find how to create a new XML file!

Apparently you go to File / New / XML, but I don't have that option, only Document or Book

Is this because it is limited in the trial version, or do I need to set up the environment differently to access XML files? or do I need to create a Schema first then create a document from that schema?

Many thanks

John