<simpleType name="PhoneEnumType">
  <annotation>
    <documentation>Enumeration of phone number types. Distinguishes voice, fax, mobile, voice/fax, and voicemail.</documentation>
  </annotation>
  <restriction base="string">
    <enumeration value="voice">
      <annotation>
        <documentation>Voice telephone number.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="fax">
      <annotation>
        <documentation>Facsimile (fax) number.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="mobile">
      <annotation>
        <documentation>Mobile or cellular phone number.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="voice/fax">
      <annotation>
        <documentation>Combined voice and fax number.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="voicemail">
      <annotation>
        <documentation>Voicemail-only number.</documentation>
      </annotation>
    </enumeration>
  </restriction>
</simpleType>