<xsd:element name="set-port" type="port-number-simple-type" minOccurs="0"/>

    <xsd:complexType name="port-number-type">
        <xsd:attribute name="number" type="port-number-simple-type" use="required"/>
    </xsd:complexType>

    <xsd:simpleType name="port-number-simple-type">
        <xsd:restriction base="xsd:positiveInteger">
            <xsd:minInclusive value="1"/>
            <xsd:maxInclusive value="65535"/>
        </xsd:restriction>
    </xsd:simpleType>