For example, in this case the UI should display selectable hazards, bu the dropdown is empty:

<xsd:element name="ergo.hazard" minOccurs="0" nillable="true">
<xsd:simpleType>
<xsd:restriction base="xsd:string">
<xsd:enumeration value="PGA" />
<xsd:enumeration value="PGV" />
<xsd:enumeration value="PGD" />
<xsd:enumeration value="SA" />
<xsd:enumeration value="SV" />
<xsd:enumeration value="SD" />
<xsd:enumeration value="liquefactionPGD" />
</xsd:restriction>
</xsd:simpleType>
</xsd:element>