The GetStructure( struct ) command returns the three interface procedures of the quantity-with-error structure of type struct.

The three interface procedures are returned in an expression sequence.

The first item is the procedure that returns the central value of a quantity-with-error of type struct.

The second item is the procedure that returns the absolute uncertainty of a quantity-with-error of type struct.

The third item is the procedure that returns the identifier of a quantity-with-error of type struct.