<xs:element name="CalibrationObservation">
  <xs:annotation>
    <xs:documentation>
Description of a generic spectroscopic calibration observation.  Like <Observation>, this is
mostly a place-holder which merely says "Do an appropriate calibration right now
using the present parameters."  What constitutes an "appropriate" calibration observation
should be decided by the server, but this presumably entails observing a wavelength
standard (e.g. between sequences of normal observations to insure wavelength calibration
stability).
			</xs:documentation>
  </xs:annotation>
  <xs:complexType>
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:element ref="Calibration"/>
      <xs:element ref="History"/>
      <xs:element ref="ImageData"/>
      <xs:element ref="Telemetry"/>
    </xs:choice>
    <xs:attributeGroup ref="RTMLTagAttributes"/>
  </xs:complexType>
</xs:element>