They are either base types or type constructors. Name A unique identifier that can be used to reference the part of the dataset associated with this variable. Type The data type contained by the variable. UInt32 is a 32 bit unsigned integer. Float64 is the IEEE 64 bit floating point data type.
String is a sequence of bytes terminated by a null character.
Please refer to Section 2.1 for more information about these strings. The declaration in a DDS of a variable of any of the base types is simply the type of the variable, followed by its name, and a semicolon.