<simpleType name="EmailEnumType">
  <restriction base="string">
    <enumeration value="personal">
      <annotation>
        <documentation>Personal email address.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="business">
      <annotation>
        <documentation>Business or work email address.</documentation>
      </annotation>
    </enumeration>
  </restriction>
</simpleType>