<xs:element name="GradeSurface">
<xs:complexType>
<xs:choice maxOccurs="unbounded">
<xs:element ref="Start" minOccurs="0" />
<xs:element ref="Zones" maxOccurs="2" />
<xs:element ref="Feature" minOccurs="0" maxOccurs="unbounded" />
</xs:choice>
<xs:attribute name="alignmentRef" type="alignmentNameRef" use="required" />
<xs:attribute name="stationAlignmentRef" type="alignmentNameRef" />
<xs:attribute name="surfaceType" type="zoneSurfaceType" use="required" />
<xs:attribute name="surfaceRef" type="surfaceNameRef" />
<xs:attribute name="surfaceRefs" type="surfaceNameRefs" />
<xs:attribute name="cgPointRefs" type="pointNameRefs" />
<xs:attribute name="name" type="xs:string" />
<xs:attribute name="desc" type="xs:string" />
<xs:attribute name="state" type="stateType" />
</xs:complexType>
</xs:element>
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