Oops, forgot my references:

You've commented that you're just getting to grips with DTDs, is it going to cause a great problem if I design the next version of XDELTA using XML Schemas [1,2]? Schemas provide a great deal more flexibility

[1] Schema Structures - http://www.w3.org/TR/xmlschema-1/ [2] Schema Datatypes - http://www.w3.org/TR/xmlschema-2/ Cheers, L.