<?xml version="1.0" encoding="UTF-8"?>
  <!-- PDS4 XML/Schema for Name Space Id:chan1  Version:1.2.0.0 - Mon Nov 24 21:00:07 UTC 2025 -->
  <!-- Generated from the PDS4 Information Model Version 1.24.0.0 - System Build 15.1 -->
  <!-- *** This PDS4 product schema is an operational deliverable. *** -->
  <!--                                                                           -->
  <!--               Dictionary Stack                                            -->
  <!-- 1.24.0.0 - pds: - Common Dictionary                                       -->
  <!-- 1.2.0.0 - chan1: - Chandrayaan-1 Mission Dictionary                       -->
  <!--                                                                           -->
  <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
    targetNamespace="http://pds.nasa.gov/pds4/mission/chan1/v1"
    xmlns:chan1="http://pds.nasa.gov/pds4/mission/chan1/v1"
    xmlns:pds="http://pds.nasa.gov/pds4/pds/v1"
    elementFormDefault="qualified"
    attributeFormDefault="unqualified"
    version="1.2.0.0">
 
    <xs:import namespace="http://pds.nasa.gov/pds4/pds/v1" schemaLocation="https://pds.nasa.gov/pds4/pds/v1/PDS4_PDS_1O00.xsd"/>
 
  <xs:annotation>
    <xs:documentation>

        The Chandrayaan-1 mission dictionary contains a class with attributes specific to the 
        Chandrayaan-1 mission and instruments. This dictionary was created for the migration
        of Chandrayaan data products from PDS3 to PDS4.
        
        v1.0.0.0 GEO/EAG 
        - Initial version of the Chandrayaan mission dictionary for PDS3 to PDS4 migration
        
        v1.1.0.0, T.Hare
        - Initial updates for M3

        v1.1.1.0, M. St. Clair
        - Further updates for M3
        - Pull release for 1.E.0.0
	    
	    v1.1.1.1, M. St. Clair
	    - add 'UNK' to spacecraft clock fields
	    
	    v1.2.0.0, J. Ward
	    - Added Mini-RF_Parameters class
        
    
    </xs:documentation>
  </xs:annotation>
 
  <xs:element name="Chandrayaan-1_Parameters" type="chan1:Chandrayaan-1_Parameters"> </xs:element>
  <xs:element name="Initial_Spacecraft_Orientation" type="chan1:Initial_Spacecraft_Orientation"> </xs:element>
  <xs:element name="Mini-RF_Parameters" type="chan1:Mini-RF_Parameters"> </xs:element>
  <xs:element name="Spacecraft_Orientation" type="chan1:Spacecraft_Orientation"> </xs:element>
  <xs:element name="Spacecraft_Orientation_Axis_Vector" type="chan1:Spacecraft_Orientation_Axis_Vector"> </xs:element>
  <xs:element name="Spacecraft_Orientation_Rates" type="chan1:Spacecraft_Orientation_Rates"> </xs:element>

  <xs:complexType name="Bands">
    <xs:annotation>
      <xs:documentation> Container class for specifying the order of
        bands and their name in a multi-band radar image.
        </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name="band_number" type="chan1:band_number" minOccurs="1" maxOccurs="1"> </xs:element>
      <xs:element name="band_name" type="chan1:band_name" minOccurs="1" maxOccurs="1"> </xs:element>
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="Chandrayaan-1_Parameters">
    <xs:annotation>
      <xs:documentation>Container class for general Chandrayaan-1
        related parameters.</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name="release_id" type="chan1:release_id" minOccurs="0" maxOccurs="1"> </xs:element>
      <xs:element name="mission_phase_name" type="chan1:mission_phase_name" minOccurs="0" maxOccurs="1"> </xs:element>
      <xs:element name="orbit_number" type="chan1:orbit_number" minOccurs="0" maxOccurs="1"> </xs:element>
      <xs:element name="spacecraft_clock_start_count" type="chan1:spacecraft_clock_start_count" minOccurs="0" maxOccurs="1"> </xs:element>
      <xs:element name="spacecraft_clock_stop_count" type="chan1:spacecraft_clock_stop_count" minOccurs="0" maxOccurs="1"> </xs:element>
      <xs:element name="instrument_mode_id" type="chan1:instrument_mode_id" minOccurs="0" maxOccurs="1"> </xs:element>
      <xs:element name="instrument_mode_desc" type="chan1:instrument_mode_desc" minOccurs="0" maxOccurs="1"> </xs:element>
      <xs:element name="producer_full_name" type="chan1:producer_full_name" minOccurs="0" maxOccurs="1"> </xs:element>
      <xs:element name="producer_institution_name" type="chan1:producer_institution_name" minOccurs="0" maxOccurs="1"> </xs:element>
      <xs:element name="spacecraft_yaw_direction" type="chan1:spacecraft_yaw_direction" minOccurs="0" maxOccurs="1"> </xs:element>
      <xs:element name="orbit_limb_direction" type="chan1:orbit_limb_direction" minOccurs="0" maxOccurs="1"> </xs:element>
      <xs:element name="orientation_epoch_time" type="chan1:orientation_epoch_time" minOccurs="0" maxOccurs="1"> </xs:element>
      <xs:element name="spacecraft_rotation_rate" type="chan1:spacecraft_rotation_rate" minOccurs="0" maxOccurs="1"> </xs:element>
      <xs:element ref="chan1:Initial_Spacecraft_Orientation" minOccurs="0" maxOccurs="1"> </xs:element>
      <xs:element ref="chan1:Spacecraft_Orientation" minOccurs="0" maxOccurs="1"> </xs:element>
      <xs:element ref="chan1:Spacecraft_Orientation_Rates" minOccurs="0" maxOccurs="1"> </xs:element>
      <xs:element ref="chan1:Spacecraft_Orientation_Axis_Vector" minOccurs="0" maxOccurs="1"> </xs:element>
      <xs:element ref="chan1:Mini-RF_Parameters" minOccurs="0" maxOccurs="1"> </xs:element>
    </xs:sequence>
    <!-- Begin assert statements for schematron - Enumerated Values -->
    <!-- <xs:assert test="chan1:mission_phase_name = ('Nominal Mission', 'Primary Mission')"/> -->
    <!-- <xs:assert test="chan1:spacecraft_yaw_direction = ('Forward', 'Reverse')"/> -->
    <!-- <xs:assert test="chan1:orbit_limb_direction = ('Ascending', 'Descending')"/> -->
    <!-- End assert statements for schematron - Enumerated Values -->
  </xs:complexType>

  <xs:complexType name="Initial_Spacecraft_Orientation">
    <xs:annotation>
      <xs:documentation>Class for the initial Chandrayaan-1 spacecraft
        orientation parameters, roll/pitch/yaw in degrees from 'ideal
        nadir'</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name="roll" nillable="true" type="chan1:roll" minOccurs="1" maxOccurs="1"> </xs:element>
      <xs:element name="pitch" nillable="true" type="chan1:pitch" minOccurs="1" maxOccurs="1"> </xs:element>
      <xs:element name="yaw" nillable="true" type="chan1:yaw" minOccurs="1" maxOccurs="1"> </xs:element>
    </xs:sequence>
    <!-- Begin assert statements for schematron - Enumerated Values -->
    <!-- <xs:assert test=")"/> -->
    <!-- End assert statements for schematron - Enumerated Values -->
  </xs:complexType>

  <xs:complexType name="Mini-RF_Parameters">
    <xs:annotation>
      <xs:documentation>Class for Chandrayaan-1 parameters relating to
        the Mini-RF (Mini-SAR) instrument.</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name="center_frequency" type="chan1:center_frequency" minOccurs="0" maxOccurs="1"> </xs:element>
      <xs:element name="look_direction" type="chan1:look_direction" minOccurs="0" maxOccurs="1"> </xs:element>
      <xs:element name="radar_incidence_angle" type="chan1:radar_incidence_angle" minOccurs="0" maxOccurs="1"> </xs:element>
      <xs:element name="azimuth_resolution" type="chan1:azimuth_resolution" minOccurs="0" maxOccurs="1"> </xs:element>
      <xs:element name="range_resolution" type="chan1:range_resolution" minOccurs="0" maxOccurs="1"> </xs:element>
      <xs:element name="line_exposure_duration" type="chan1:line_exposure_duration" minOccurs="0" maxOccurs="1"> </xs:element>
      <xs:element name="Bands" type="chan1:Bands" minOccurs="0" maxOccurs="unbounded"> </xs:element>
      <xs:element name="Range_Coefficent_Set" type="chan1:Range_Coefficent_Set" minOccurs="0" maxOccurs="unbounded"> </xs:element>
    </xs:sequence>
    <!-- Begin assert statements for schematron - Enumerated Values -->
    <!-- <xs:assert test="chan1:look_direction = ('Left', 'Right')"/> -->
    <!-- End assert statements for schematron - Enumerated Values -->
  </xs:complexType>

  <xs:complexType name="Range_Coefficent_Set">
    <xs:annotation>
      <xs:documentation> Container class for defining sets of
        coefficents used for resampling slant range (in meters) to
        approximate ground range (in meters). </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name="coefficent_time" type="chan1:coefficent_time" minOccurs="1" maxOccurs="1"> </xs:element>
      <xs:element name="coefficent_1" type="chan1:coefficent_1" minOccurs="1" maxOccurs="1"> </xs:element>
      <xs:element name="coefficent_2" type="chan1:coefficent_2" minOccurs="1" maxOccurs="1"> </xs:element>
      <xs:element name="coefficent_3" type="chan1:coefficent_3" minOccurs="1" maxOccurs="1"> </xs:element>
      <xs:element name="coefficent_4" type="chan1:coefficent_4" minOccurs="1" maxOccurs="1"> </xs:element>
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="Spacecraft_Orientation">
    <xs:annotation>
      <xs:documentation>Class for Chandrayaan-1 spacecraft orientation
        parameters, roll/pitch/yaw in degrees from 'ideal
        nadir'</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name="roll" nillable="true" type="chan1:roll" minOccurs="1" maxOccurs="1"> </xs:element>
      <xs:element name="pitch" nillable="true" type="chan1:pitch" minOccurs="1" maxOccurs="1"> </xs:element>
      <xs:element name="yaw" nillable="true" type="chan1:yaw" minOccurs="1" maxOccurs="1"> </xs:element>
    </xs:sequence>
    <!-- Begin assert statements for schematron - Enumerated Values -->
    <!-- <xs:assert test=")"/> -->
    <!-- End assert statements for schematron - Enumerated Values -->
  </xs:complexType>

  <xs:complexType name="Spacecraft_Orientation_Axis_Vector">
    <xs:annotation>
      <xs:documentation>Class for Chandrayaan-1 spacecraft orientation
        axis vector, x/y/z unit vector wrt J2000 describing rotation
        direction since epoch</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name="x_unit" nillable="true" type="chan1:x_unit" minOccurs="1" maxOccurs="1"> </xs:element>
      <xs:element name="y_unit" nillable="true" type="chan1:y_unit" minOccurs="1" maxOccurs="1"> </xs:element>
      <xs:element name="z_unit" nillable="true" type="chan1:z_unit" minOccurs="1" maxOccurs="1"> </xs:element>
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="Spacecraft_Orientation_Rates">
    <xs:annotation>
      <xs:documentation>Class for Chandrayaan-1 spacecraft orientation
        rate parameters, roll/pitch/yaw in degrees/second since
        epoch</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name="roll_rate" nillable="true" type="chan1:roll_rate" minOccurs="1" maxOccurs="1"> </xs:element>
      <xs:element name="pitch_rate" nillable="true" type="chan1:pitch_rate" minOccurs="1" maxOccurs="1"> </xs:element>
      <xs:element name="yaw_rate" nillable="true" type="chan1:yaw_rate" minOccurs="1" maxOccurs="1"> </xs:element>
    </xs:sequence>
  </xs:complexType>

    <xs:annotation>
      <xs:documentation>This section contains the simpleTypes that provide more constraints
        than those at the base data type level. The simpleTypes defined here build on the base data
        types. This is another component of the common dictionary and therefore falls within the
        common namespace.
      </xs:documentation>
    </xs:annotation>

  <xs:simpleType name="azimuth_resolution_WO_Units">
    <xs:restriction base="pds:ASCII_Real">
     <xs:minInclusive value="0.0"/>
     <xs:maxInclusive value="1.7976931348623157e308"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:complexType name="azimuth_resolution">
    <xs:annotation>
      <xs:documentation> The true resolution of the radar image in the
        azimuth (along track) direction, evaluated at the center of the
        image for the transmit, receive, and processing parameters used
        for the sequence. </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base="chan1:azimuth_resolution_WO_Units">
        <xs:attribute name="unit" type="pds:Units_of_Length" use="required" />
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <xs:simpleType name="band_name">
    <xs:annotation>
      <xs:documentation> The name used to describe a type of band in a
        multi-band radar image. Examples include "V Receive Intensity"
        and "Circular Polarization Ratio". </xs:documentation>
    </xs:annotation>
    <xs:restriction base="pds:ASCII_Short_String_Collapsed">
     <xs:minLength value="1"/>
     <xs:maxLength value="255"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="band_number">
    <xs:annotation>
      <xs:documentation> The sequence number for a band in a multi-band
        radar image. </xs:documentation>
    </xs:annotation>
    <xs:restriction base="pds:ASCII_Integer">
     <xs:minInclusive value="1"/>
     <xs:maxInclusive value="9223372036854775807"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="center_frequency_WO_Units">
    <xs:restriction base="pds:ASCII_Real">
     <xs:minInclusive value="0.0"/>
     <xs:maxInclusive value="1.7976931348623157e308"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:complexType name="center_frequency">
    <xs:annotation>
      <xs:documentation> The center_frequency element provides the
        frequency of maximum transmittance of a filter or the frequency
        that corresponds to the geometric center of the passband of a
        filter or a channel. </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base="chan1:center_frequency_WO_Units">
        <xs:attribute name="unit" type="pds:Units_of_Frequency" use="required" />
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <xs:simpleType name="coefficent_1">
    <xs:annotation>
      <xs:documentation> The first of a set of 4 polynomial coefficients
        used for resampling slant range (in meters) to approximate
        ground range (in meters). </xs:documentation>
    </xs:annotation>
    <xs:restriction base="pds:ASCII_Real">
     <xs:minInclusive value="-1.7976931348623157e308"/>
     <xs:maxInclusive value="1.7976931348623157e308"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="coefficent_2">
    <xs:annotation>
      <xs:documentation> The second of a set of 4 polynomial
        coefficients used for resampling slant range (in meters) to
        approximate ground range (in meters). </xs:documentation>
    </xs:annotation>
    <xs:restriction base="pds:ASCII_Real">
     <xs:minInclusive value="-1.7976931348623157e308"/>
     <xs:maxInclusive value="1.7976931348623157e308"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="coefficent_3">
    <xs:annotation>
      <xs:documentation> The third of a set of 4 polynomial coefficients
        used for resampling slant range (in meters) to approximate
        ground range (in meters). </xs:documentation>
    </xs:annotation>
    <xs:restriction base="pds:ASCII_Real">
     <xs:minInclusive value="-1.7976931348623157e308"/>
     <xs:maxInclusive value="1.7976931348623157e308"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="coefficent_4">
    <xs:annotation>
      <xs:documentation> The fourth of a set of 4 polynomial
        coefficients used for resampling slant range (in meters) to
        approximate ground range (in meters). </xs:documentation>
    </xs:annotation>
    <xs:restriction base="pds:ASCII_Real">
     <xs:minInclusive value="-1.7976931348623157e308"/>
     <xs:maxInclusive value="1.7976931348623157e308"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="coefficent_time">
    <xs:annotation>
      <xs:documentation> The time associated with a set of 4 polynomial
        coefficients used for resampling slant range (in meters) to
        approximate ground range (in meters) at that time.
        </xs:documentation>
    </xs:annotation>
    <xs:restriction base="pds:ASCII_Date_Time_YMD">
  <!-- format="YYYY-MM-DDTHH:MM:SS.SSSSSS(Z)" -->
	   </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="instrument_mode_desc">
    <xs:annotation>
      <xs:documentation>The instrument_mode_desc element describes the
        instrument mode that is identified by the instrument_mode_id
        element.</xs:documentation>
    </xs:annotation>
    <xs:restriction base="pds:ASCII_Short_String_Collapsed">
     <xs:minLength value="1"/>
     <xs:maxLength value="255"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="instrument_mode_id">
    <xs:annotation>
      <xs:documentation> The instrument_mode_id element provides an
        instrument-dependent designation of operating mode. This may be
        simply a number, letter, code, or a word. </xs:documentation>
    </xs:annotation>
    <xs:restriction base="pds:ASCII_Short_String_Collapsed">
     <xs:minLength value="1"/>
     <xs:maxLength value="255"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="line_exposure_duration_WO_Units">
    <xs:restriction base="pds:ASCII_Real">
     <xs:minInclusive value="0.0"/>
     <xs:maxInclusive value="1.7976931348623157e308"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:complexType name="line_exposure_duration">
    <xs:annotation>
      <xs:documentation> The line_exposure_duration data element
        indicates the time elapsed during the aquisition of one radar
        image line of data. </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base="chan1:line_exposure_duration_WO_Units">
        <xs:attribute name="unit" type="pds:Units_of_Time" use="required" />
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <xs:simpleType name="look_direction">
    <xs:annotation>
      <xs:documentation> The value (Right or Left) indicates the side of
        the spacecraft groundtrack to which the antenna is pointed for
        data acquired within a synthetic aperture radar (SAR) image.
        Most SAR instruments acquire an image on only one side of the
        ground track at one time. This value also indicates from which
        side the SAR image is illuminated. If the spacecraft images to
        the left of its ground track (LOOK_DIRECTION = LEFT), the image
        will be illuminated from the (viewer's) left side, and,
        conversely, if the spacecraft looks to the right, the
        illumination will come from the right in the image file. The
        direction of illumination is critical to interpretation of
        features in the image. Mosaicked products may contain various
        combinations of source imagery. For example, they may combine
        only left-looking observations (LOOK_DIRECTION = 'LEFT'), only
        right-looking observations (LOOK_DIRECTION = 'RIGHT'), or a
        mixture of the two (LOOK_DIRECTION = {'LEFT','RIGHT'}).
        </xs:documentation>
    </xs:annotation>
    <xs:restriction base="pds:ASCII_Short_String_Collapsed">
     <xs:minLength value="1"/>
     <xs:maxLength value="255"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="mission_phase_name">
    <xs:annotation>
      <xs:documentation> The mission_phase_name element provides the
        commonly-used identifier of a mission phase. </xs:documentation>
    </xs:annotation>
    <xs:restriction base="pds:ASCII_Short_String_Collapsed">
     <xs:minLength value="1"/>
     <xs:maxLength value="255"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="orbit_limb_direction">
    <xs:annotation>
      <xs:documentation> The orbit_limb attribute provides the direction
        of the spacecraft orbit with respect to the lunar limb. valids:
        "Ascending", "Descending" </xs:documentation>
    </xs:annotation>
    <xs:restriction base="pds:ASCII_Short_String_Collapsed">
     <xs:minLength value="1"/>
     <xs:maxLength value="255"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="orbit_number">
    <xs:annotation>
      <xs:documentation> The orbit_number element identifies the number
        of the orbital revolution of the spacecraft around a target
        body. </xs:documentation>
    </xs:annotation>
    <xs:restriction base="pds:ASCII_NonNegative_Integer">
    	<xs:pattern value='[0-9]+'/>
     <xs:minInclusive value="0"/>
     <xs:maxInclusive value="18446744073709551615"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="orientation_epoch_time_WO_Units">
    <xs:restriction base="pds:ASCII_Real">
     <xs:minInclusive value="-1.7976931348623157e308"/>
     <xs:maxInclusive value="1.7976931348623157e308"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:complexType name="orientation_epoch_time">
    <xs:annotation>
      <xs:documentation>orientation_epoch_time indicates time for the
        recorded orentiation. </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base="chan1:orientation_epoch_time_WO_Units">
        <xs:attribute name="unit" type="pds:Units_of_Time" use="required" />
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <xs:simpleType name="pitch_WO_Units">
    <xs:restriction base="pds:ASCII_Real">
     <xs:minInclusive value="-1.7976931348623157e308"/>
     <xs:maxInclusive value="1.7976931348623157e308"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:complexType name="pitch">
    <xs:annotation>
<xs:documentation>Rotation about the Y-axis.</xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base="chan1:pitch_WO_Units">
        <xs:attribute name="unit" type="pds:Units_of_Angle" use="required" />
        <xs:attribute name="nilReason" type="pds:nil_reason" use="optional" />
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <xs:simpleType name="pitch_rate_WO_Units">
    <xs:restriction base="pds:ASCII_Real">
     <xs:minInclusive value="-1.7976931348623157e308"/>
     <xs:maxInclusive value="1.7976931348623157e308"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:complexType name="pitch_rate">
    <xs:annotation>
      <xs:documentation>Rate of rotation about the Y-axis in
        deg/sec.</xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base="chan1:pitch_rate_WO_Units">
        <xs:attribute name="unit" type="pds:Units_of_Angular_Velocity" use="required" />
        <xs:attribute name="nilReason" type="pds:nil_reason" use="optional" />
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <xs:simpleType name="producer_full_name">
    <xs:annotation>
      <xs:documentation> The producer_full_name element provides the
        full_name of the individual mainly responsible for the
        production of a data set. </xs:documentation>
    </xs:annotation>
    <xs:restriction base="pds:ASCII_Short_String_Collapsed">
     <xs:minLength value="1"/>
     <xs:maxLength value="255"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="producer_institution_name">
    <xs:annotation>
      <xs:documentation> The producer_institution_name element
        identifies a university, research center, NASA center or other
        institution associated with the production of a data set. This
        would generally be an institution associated with the element
        producer_full_name. </xs:documentation>
    </xs:annotation>
    <xs:restriction base="pds:ASCII_Short_String_Collapsed">
     <xs:minLength value="1"/>
     <xs:maxLength value="255"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="radar_incidence_angle_WO_Units">
    <xs:restriction base="pds:ASCII_Real">
     <xs:minInclusive value="0.0"/>
     <xs:maxInclusive value="90.0"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:complexType name="radar_incidence_angle">
    <xs:annotation>
      <xs:documentation> Radar incidence_angle is defined as the value
        of the angle between the local vertical and the spacecraft
        direction. </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base="chan1:radar_incidence_angle_WO_Units">
        <xs:attribute name="unit" type="pds:Units_of_Angle" use="required" />
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <xs:simpleType name="range_resolution_WO_Units">
    <xs:restriction base="pds:ASCII_Real">
     <xs:minInclusive value="0.0"/>
     <xs:maxInclusive value="1.7976931348623157e308"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:complexType name="range_resolution">
    <xs:annotation>
      <xs:documentation> The true resolution of the radar image in the
        range (across track) direction, evaluated at the center of the
        image for the transmit, receive, and processing parameters used
        for the sequence. </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base="chan1:range_resolution_WO_Units">
        <xs:attribute name="unit" type="pds:Units_of_Length" use="required" />
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <xs:simpleType name="release_id">
    <xs:annotation>
      <xs:documentation>Release_id is the identifier of a scheduled
        release of data by PDS. The first data release is Release 0001.
        The release_id for a given product is always the first release
        in which it appears, and does not change if the product is
        revised later.</xs:documentation>
    </xs:annotation>
    <xs:restriction base="pds:ASCII_Short_String_Collapsed">
     <xs:minLength value="1"/>
     <xs:maxLength value="255"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="roll_WO_Units">
    <xs:restriction base="pds:ASCII_Real">
     <xs:minInclusive value="-1.7976931348623157e308"/>
     <xs:maxInclusive value="1.7976931348623157e308"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:complexType name="roll">
    <xs:annotation>
<xs:documentation>Rotation about the X-axis.</xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base="chan1:roll_WO_Units">
        <xs:attribute name="unit" type="pds:Units_of_Angle" use="required" />
        <xs:attribute name="nilReason" type="pds:nil_reason" use="optional" />
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <xs:simpleType name="roll_rate_WO_Units">
    <xs:restriction base="pds:ASCII_Real">
     <xs:minInclusive value="-1.7976931348623157e308"/>
     <xs:maxInclusive value="1.7976931348623157e308"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:complexType name="roll_rate">
    <xs:annotation>
      <xs:documentation>Rate of rotation about the X-axis in
        deg/sec.</xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base="chan1:roll_rate_WO_Units">
        <xs:attribute name="unit" type="pds:Units_of_Angular_Velocity" use="required" />
        <xs:attribute name="nilReason" type="pds:nil_reason" use="optional" />
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <xs:simpleType name="spacecraft_clock_start_count">
    <xs:annotation>
      <xs:documentation>The spacecraft_clock_start_count attribute
        provides the value of the spacecraft clock at the beginning of a
        time period of interest. </xs:documentation>
    </xs:annotation>
    <xs:restriction base="pds:ASCII_Short_String_Collapsed">
    	<xs:pattern value='(([0-9]{1,2}\/)[0-9]{1,10}(\.[0-9]{1,5})?)|(UNK)'/>
     <xs:minLength value="1"/>
     <xs:maxLength value="255"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="spacecraft_clock_stop_count">
    <xs:annotation>
      <xs:documentation>The spacecraft_clock_stop_count attribute
        provides the value of the spacecraft clock at the end of a time
        period of interest. </xs:documentation>
    </xs:annotation>
    <xs:restriction base="pds:ASCII_Short_String_Collapsed">
    	<xs:pattern value='(([0-9]{1,2}\/)[0-9]{1,10}(\.[0-9]{1,5})?)|(UNK)'/>
     <xs:minLength value="1"/>
     <xs:maxLength value="255"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="spacecraft_rotation_rate_WO_Units">
    <xs:restriction base="pds:ASCII_Real">
     <xs:minInclusive value="-1.7976931348623157e308"/>
     <xs:maxInclusive value="1.7976931348623157e308"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:complexType name="spacecraft_rotation_rate">
    <xs:annotation>
      <xs:documentation>Scalar rotation rate in degrees/second since
        epoch.</xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base="chan1:spacecraft_rotation_rate_WO_Units">
        <xs:attribute name="unit" type="pds:Units_of_Angular_Velocity" use="required" />
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <xs:simpleType name="spacecraft_yaw_direction">
    <xs:annotation>
      <xs:documentation> The spacecraft_yaw_direction attribute provides
        the spacecraft yaw (look) mode. valids: "Forward", "Reverse"
        </xs:documentation>
    </xs:annotation>
    <xs:restriction base="pds:ASCII_Short_String_Collapsed">
     <xs:minLength value="1"/>
     <xs:maxLength value="255"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:complexType name="x_unit">
    <xs:annotation>
      <xs:documentation>The x component of a unit Cartesian
        vector.</xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base="pds:ASCII_Real">
        <xs:attribute name="nilReason" type="pds:nil_reason" use="optional" />
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <xs:complexType name="y_unit">
    <xs:annotation>
      <xs:documentation>The y component of a unit Cartesian
        vector.</xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base="pds:ASCII_Real">
        <xs:attribute name="nilReason" type="pds:nil_reason" use="optional" />
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <xs:simpleType name="yaw_WO_Units">
    <xs:restriction base="pds:ASCII_Real">
     <xs:minInclusive value="-1.7976931348623157e308"/>
     <xs:maxInclusive value="1.7976931348623157e308"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:complexType name="yaw">
    <xs:annotation>
<xs:documentation>Rotation about the Z-axis.</xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base="chan1:yaw_WO_Units">
        <xs:attribute name="unit" type="pds:Units_of_Angle" use="required" />
        <xs:attribute name="nilReason" type="pds:nil_reason" use="optional" />
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <xs:simpleType name="yaw_rate_WO_Units">
    <xs:restriction base="pds:ASCII_Real">
     <xs:minInclusive value="-1.7976931348623157e308"/>
     <xs:maxInclusive value="1.7976931348623157e308"/>
	   </xs:restriction>
  </xs:simpleType>

  <xs:complexType name="yaw_rate">
    <xs:annotation>
      <xs:documentation>Rate of rotation about the Z-axis in
        deg/sec.</xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base="chan1:yaw_rate_WO_Units">
        <xs:attribute name="unit" type="pds:Units_of_Angular_Velocity" use="required" />
        <xs:attribute name="nilReason" type="pds:nil_reason" use="optional" />
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <xs:complexType name="z_unit">
    <xs:annotation>
      <xs:documentation>The z component of a unit Cartesian
        vector.</xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base="pds:ASCII_Real">
        <xs:attribute name="nilReason" type="pds:nil_reason" use="optional" />
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>
</xs:schema>
