The SDL defines the SimpleTypes similar to the CTS primitive types, including String, Int32, Double, Decimal, Guid, and DateTime, among others. An Enumeration, which defines a map of primitive values and names, is also considered a simple type.
The SDL describes SimpleTypes in a way similar to CTS fundamental types, which include String, Int32, Double, Decimal, Guid, and DateTime, among others. An Enumeration is considered a simple type due to its definition of a mapping between basic values and names.