XTCE13 — Duplicated BaseCalibratorType extension

XTCE 1.2 defined as base data type for calibrators (BaseCalibratorType).
This data type is used an extension twice for each calibrator:

• Once in CalibratorType
• Again in the child element (e.g., PolynomialCalibratorType)

BaseCalibratorType usage was intended

The BaseCalibratorType defines attributes of a name, shortDescription, and an element of AncillaryData. This is used in CalibratorType and all 3 of the Calibrators that can appear in that element.

In the XTCE 1.2 RTF this was discussed. It was chosen to keep this added flexibility although it does seem to be redundant.

For implementers, when a calibrator can be named and documented with a description, the most specific one (in the specific Calibrator element) should be preferred over the higher level one in the Calibrator or DefaultCalibrator element if both exist in the XTCE document.