<xsd:element minOccurs="0" maxOccurs="unbounded" name="value" nillable="true">
    <xsd:complexType>
        <xsd:simpleContent>
            <xsd:extension base="xsd:nonNegativeInteger">
                <xsd:attribute name="upper-range" use="optional">
                    <xsd:simpleType>
                        <xsd:restriction base="xsd:nonNegativeInteger">
                            <xsd:maxInclusive value="100" />
                        </xsd:restriction>
                    </xsd:simpleType>
                </xsd:attribute>
                <xsd:attribute name="lower-range" use="optional">
                    <xsd:simpleType>
                        <xsd:restriction base="xsd:nonNegativeInteger">
                            <xsd:maxInclusive value="100" />
                        </xsd:restriction>
                    </xsd:simpleType>
                </xsd:attribute>
            </xsd:extension>
        </xsd:simpleContent>
    </xsd:complexType>
</xsd:element>