Can someone tell me the differences between:
1.Rosettanet XML & Ordinary XML?
2.Rosettanet DTD & Ordinary DTD?

what should i call the XML message if it has some of the PIP information contained in it?

e.g: <?xml version="1.0" encoding="UTF-8"?>

Here You go :

1.Rosettanet XML & Ordinary XML:There is no difference means both are interlinked.Reason is all Rosettanet PIPs are based on XML standards(based on xml format).

2.Rosettanet DTD & Ordinary DTD:Tecnically DTD functinality is same in XML dtd as well as Rosettanet dtd,but rosettanet DTD is having additional info with specific headers like Preamble,delivery,service and remaining is content (actual data)in XML format.

3.XML message if it has some of the PIP information contained in it:

Its called as RNO (Rosettanet objects)
or Rosettanet Messages.

Thats the reason all Rosettanet messages have content-type as application/XML.

Hope this helps your questions…