<xs:simpleType name="cloudCoverAnnex3Type">
  <xs:annotation>
    <xs:documentation>
      <html:div xmlns="http://www.w3.org/1999/xhtml">
        <p>From the ICAO's "Annex 3 to the Convention on International Civil Aviation: Meteorological Service for International Air Navigation", Appendix 1, page 16.</p>
        <dl>
          <dt>SKC</dt>
          <dd>sky clear (0/8)</dd>
          <dt>FEW</dt>
          <dd>few (1/8 to 2/8)</dd>
          <dt>SCT</dt>
          <dd>scattered (3/8 to 4/8)</dd>
          <dt>BKN</dt>
          <dd>broken (5/8 to 7/8)</dd>
          <dt>OVC</dt>
          <dd>overcast (8/8)</dd>
          <dt>ISOL</dt>
          <dd>individual CBs (isolated, CB only)</dd>
          <dt>OCNL</dt>
          <dd>well-separated CBs (occasional, CB only)</dd>
          <dt>FRQ</dt>
          <dd>CBs with little or no separation (frequent, CB only)</dd>
          <dt>EMBD</dt>
          <dd>CBs embedded in layers of other clouds or concealed by haze (embedded, CB only)</dd>
        </dl>
      </html:div>
    </xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:string">
    <xs:enumeration value="SKC"/>
    <xs:enumeration value="FEW"/>
    <xs:enumeration value="SCT"/>
    <xs:enumeration value="BKN"/>
    <xs:enumeration value="OVC"/>
    <xs:enumeration value="ISOL"/>
    <xs:enumeration value="OCNL"/>
    <xs:enumeration value="FRQ"/>
    <xs:enumeration value="EMBD"/>
  </xs:restriction>
</xs:simpleType>