<xs:simpleType name="zoneMaterialType">
<xs:restriction base="xs:string">
<xs:enumeration value="pavement-high-type" />
<xs:enumeration value="pavement-intermediate-type" />
<xs:enumeration value="pavement-low-type" />
<xs:enumeration value="soil" />
<xs:enumeration value="concrete" />
<xs:enumeration value="stone" />
<xs:enumeration value="riprap" />
<xs:enumeration value="turf" />
<xs:enumeration value="gravel" />
<xs:enumeration value="paved" />
<xs:enumeration value="metal" />
<xs:enumeration value="metal grate" />
<xs:enumeration value="composite" />
<xs:enumeration value="timber" />
<xs:enumeration value="other" />
</xs:restriction>
</xs:simpleType>
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