Referencia.
<xs:attribute name="reference" use="required"> <xs:annotation> <xs:documentation>Referencia.</xs:documentation> </xs:annotation> <xs:simpleType> <xs:restriction base="xs:string"> <xs:enumeration value="AXIS" /> <xs:enumeration value="LEFT_SLOPE_START" /> <xs:enumeration value="RIGHT_SLOPE_START" /> </xs:restriction> </xs:simpleType> </xs:attribute>