Can you create a ITX / WTX map without type tree?

Yes, XSDs can be used directly instead of type trees from WTX 8.2 version onwards. You can either provide type trees or XSDs in the card settings during developing a map.

XERCES validation has been integrated with ITX/WTX and hence you can create a map without a type tree creation and use XSds directly. XML input received will get validated against the XSDs during runtime and throw an error in case of any discrepency.