<xsd:simpleType name="KnownContactType">
    <xsd:restriction base="xsd:string">
        <xsd:enumeration value="placed by" />
        <xsd:enumeration value="placed on behalf of" />
        <xsd:enumeration value="confirm to" />
        <xsd:enumeration value="authorized by" />
        <xsd:enumeration value="interviewer" />
        <xsd:enumeration value="supervisor" />
        <xsd:enumeration value="time approver" />
        <xsd:enumeration value="submitted by" />
        <xsd:enumeration value="created by" />
        <xsd:enumeration value="sent to" />
        <xsd:enumeration value="first day contact" />
        <xsd:enumeration value="customer complaints" />
        <xsd:enumeration value="supplier manager" />
        <xsd:enumeration value="supplier complaints" />
        <xsd:enumeration value="deputy time approver" />
    </xsd:restriction>
</xsd:simpleType>