What is the difference between base types String and GUID in thingworx?
Using GUID base type to store GUID/UUID generated from another system. Below are the observations while using TW GUID base type:
Please guide and provide a pointer to any documentation about using thingworx GUID base type.
Right now if you are on TW 6.5 better you don't use GUID property values, it has a bug that makes them unusable ( https://support.ptc.com/appserver/cs/view/solution.jsp?n=CS222276 ). Better you go with just a String property.
By the way, you questions are interesting, let's see if they answer it.