<xsd:simpleType name="DrugTestResultTypes">
    <xsd:restriction base="xsd:string">
        <xsd:enumeration value="Positive" />
        <xsd:enumeration value="PositiveDilute" />
        <xsd:enumeration value="Negative" />
        <xsd:enumeration value="NegativeDilute" />
        <xsd:enumeration value="Rejected" />
        <xsd:enumeration value="Adulterated" />
        <xsd:enumeration value="Substituted" />
        <xsd:enumeration value="Invalid" />
        <xsd:enumeration value="Dilute" />
        <xsd:enumeration value="Cancelled" />
        <xsd:enumeration value="Refused" />
    </xsd:restriction>
</xsd:simpleType>