<xsd:simpleType name="degreeTypes">
    <xsd:restriction base="xsd:string">
        <xsd:enumeration value="secondary" />
        <xsd:enumeration value="high school or equivalent" />
        <xsd:enumeration value="some high school or equivalent" />
        <xsd:enumeration value="HND/HNC or equivalent" />
        <xsd:enumeration value="vocational" />
        <xsd:enumeration value="certification" />
        <xsd:enumeration value="some college" />
        <xsd:enumeration value="associates" />
        <xsd:enumeration value="bachelors" />
        <xsd:enumeration value="some post-graduate" />
        <xsd:enumeration value="masters" />
        <xsd:enumeration value="doctorate" />
        <xsd:enumeration value="postdoctorate" />
        <xsd:enumeration value="professional" />
        <xsd:enumeration value="postprofessional" />
        <xsd:enumeration value="intermediategraduate" />
        <xsd:enumeration value="specialeducation" />
        <xsd:enumeration value="ged" />
        <xsd:enumeration value="international" />
    </xsd:restriction>
</xsd:simpleType>