Thank you very much. desiging a system where data can be merged from differant local DBs. by having UUID there wont be any conflict in primary keys when merging!

What is the datatype for UUID? 

id this one HS.FHIR.vSTU3.Model.Datatype.Uuid?

How we can autogenerate UUID when creating an object?

##class(%SYS.System).InstanceGUID()

This function returning a same UUID!!!