An integer interval boundary containing an inclusive/exclusive flag.
IVXB_INT: Interval Boundary IntegerNumber (V3 Data Type)
value and nullFlavor are mutually exclusive (one must be present)
If a value is an exceptional value (NULL-value), this specifies in what way and why proper information is missing.
Specifies whether the limit is included in the interval (interval is closed) or excluded from the interval (interval is open).