loading and saving types

It's more structured, and can store compound objects in a simple and intuitive (for people who understand SGML) way. Consider this type:

Type point
  Field x:Int
  Field y:Int
  Field connected:TList
End Type

In XML it would be trivial to store the list. In CraigScript, it isn't (currently) possible.

I don't think there's any reason to reinvent the wheel, for this particular purpose.