<simpleType name="CharacterStringType">
  <annotation>
    <documentation>A sequence of characters [specialised from ISO19103, chapter 6.5.2.7]. In FIXM, the maximum length of a CharacterString is set to 4096 characters. [FIXM]</documentation>
  </annotation>
  <restriction base="xs:string">
    <minLength value="0"/>
    <maxLength value="4096"/>
  </restriction>
</simpleType>

<simpleType name="CountType">
  <annotation>
    <documentation>Represents positive integer counts of objects.</documentation>
  </annotation>
  <restriction base="xs:int">
    <minInclusive value="0"/>
  </restriction>
</simpleType>

<simpleType name="TextNameType">
  <annotation>
    <documentation>The official name of a State, an aerodrome, a unit, etc... [AIXM 5.1]</documentation>
  </annotation>
  <restriction base="fb:CharacterStringType">
    <minLength value="0"/>
    <maxLength value="60"/>
    <pattern value="([A-Z]|[0-9]|[, !"&amp;#$%'\(\)\*\+\-\./:;&lt;=&gt;\?@\[\\\]\^_\|\{\}])*"/>
  </restriction>
</simpleType>

<simpleType name="AftnAddressType">
  <annotation>
    <documentation>Standard AFTN address.</documentation>
  </annotation>
  <restriction base="fb:CharacterStringType"/>
</simpleType>

<simpleType name="AircraftIdentificationType">
  <annotation>
    <documentation>A group of letters, figures or a combination thereof which is either identical to, or the coded equivalent of, the aircraft call sign to be used in air-ground communications, and which is used to identify the aircraft in ground-ground air traffic services communications. [ICAO Doc 4444]</documentation>
  </annotation>
  <restriction base="fb:CharacterStringType">
    <pattern value="[A-Z0-9]{1,7}"/>
  </restriction>
</simpleType>

<simpleType name="AircraftTypeDesignatorType">
  <annotation>
    <documentation>A group of alphanumeric characters used to identify, in an abbreviated form, a type of aircraft. [ICAO Doc 9426] Approved aircraft type designators are defined in ICAO Doc. 8643 - Aircraft Type Designators. [FIXM]</documentation>
  </annotation>
  <restriction base="fb:CharacterStringType">
    <pattern value="[A-Z0-9]{2,4}"/>
  </restriction>
</simpleType>

<simpleType name="DecimalIndexType">
  <annotation>
    <documentation>Generic decimal fraction expressed to tenths, used as scaling or comparison factor. [FIXM]</documentation>
  </annotation>
  <restriction base="xs:decimal">
    <totalDigits value="4"/>
    <fractionDigits value="1"/>
  </restriction>
</simpleType>

<simpleType name="DurationType">
  <annotation>
    <documentation>Length or distance in the temporal dimension. [ISO 19108, chapter 5.2.3.7] Duration has no reference to start or stop times.</documentation>
  </annotation>
  <restriction base="xs:duration"/>
</simpleType>

<complexType name="GloballyUniqueFlightIdentifierType">
  <annotation>
    <documentation>A single reference for FF-ICE information pertinent to a flight that is unique globally. [ICAO Doc 9965] This is a reference that uniquely identifies a specific flight and is independent of any particular system. [FIXM]</documentation>
  </annotation>
  <simpleContent>
    <extension base="fb:RestrictedGloballyUniqueFlightIdentifierType">
      <attribute name="codeSpace" type="xs:string" fixed="urn:uuid" use="required">
        <annotation>
          <documentation>Code Space of the GUFI</documentation>
        </annotation>
      </attribute>
    </extension>
  </simpleContent>
</complexType>

<simpleType name="RestrictedGloballyUniqueFlightIdentifierType">
  <annotation>
    <documentation>Helper type for restrictions on GloballyUniqueFlightIdentifierType</documentation>
  </annotation>
  <restriction base="fb:CharacterStringType">
    <pattern value="[0-9|aA-fF]{8}-[0-9|aA-fF]{4}-4[0-9|aA-fF]{3}-[89aAbB]{1}[0-9|aA-fF]{3}-[0-9|aA-fF]{12}"/>
  </restriction>
</simpleType>

<complexType name="SsrCodeType">
  <annotation>
    <documentation>The number assigned to a particular multiple pulse reply signal transmitted by a transponder in Mode A or Mode C. [ICAO Doc 4444]</documentation>
  </annotation>
  <simpleContent>
    <extension base="fb:RestrictedSsrCodeType">
      <attribute name="ssrMode" type="fb:SsrModeType" use="optional">
        <annotation>
          <documentation>Optional Secondary Surveillance Radar (SSR) Mode.</documentation>
        </annotation>
      </attribute>
    </extension>
  </simpleContent>
</complexType>

<simpleType name="RestrictedSsrCodeType">
  <annotation>
    <documentation>Helper type for restrictions on SsrCodeType</documentation>
  </annotation>
  <restriction base="fb:CharacterStringType">
    <pattern value="[0-7]{4}"/>
  </restriction>
</simpleType>

<simpleType name="SsrModeType">
  <annotation>
    <documentation>Represents the enumeration of Secondary Surveillance Radar (SSR) Modes: * A - Transponder-Mode A (4 digits-4,096 codes) * C - Transponder-Mode A (4 digits-4,096 codes) and Mode C * S - Transponder-Mode S, including both pressure-altitude and aircraft identification transmission</documentation>
  </annotation>
  <restriction base="xs:string">
    <enumeration value="A">
      <annotation>
        <documentation>Indicates Secondary Surveillance Radar (SSR) is operating in Transponder-Mode A.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="C">
      <annotation>
        <documentation>Indicates Secondary Surveillance Radar (SSR) Transponder-Mode A and Mode C.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="S">
      <annotation>
        <documentation>Indicates Secondary Surveillance Radar (SSR) Transponder-Mode S.</documentation>
      </annotation>
    </enumeration>
  </restriction>
</simpleType>

<complexType name="TimeType">
  <annotation>
    <documentation>A combination of a date and a time type. [ISO 19103, chapter 6.5.2.10] A Time instant placeholder for gml:TimePositionType, in its XML dataTime variation. [FIXM]</documentation>
  </annotation>
  <simpleContent>
    <extension base="fb:RestrictedTimeType">
      <attribute name="timeReference" type="xs:string" fixed="UTC" use="required">
        <annotation>
          <documentation>Time reference specification.</documentation>
        </annotation>
      </attribute>
    </extension>
  </simpleContent>
</complexType>

<simpleType name="RestrictedTimeType">
  <annotation>
    <documentation>Helper type for restrictions on TimeType</documentation>
  </annotation>
  <restriction base="xs:dateTime">
    <pattern value="-?([1-9][0-9]{3,}|0[0-9]{3})-(0[1-9]|1[0-2])-(0[1-9]|[12][0-9]|3[01])T(([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9](\.[0-9]+)?|(24:00:00(\.0+)?))Z"/>
  </restriction>
</simpleType>

<attribute name="codeSpace" type="xs:string" fixed="urn:uuid" use="required">
  <annotation>
    <documentation>Code Space of the GUFI</documentation>
  </annotation>
</attribute>

<attribute name="ssrMode" type="fb:SsrModeType" use="optional">
  <annotation>
    <documentation>Optional Secondary Surveillance Radar (SSR) Mode.</documentation>
  </annotation>
</attribute>

<attribute name="timeReference" type="xs:string" fixed="UTC" use="required">
  <annotation>
    <documentation>Time reference specification.</documentation>
  </annotation>
</attribute>