<xs:element name="systemitem">
    <xs:complexType mixed="true">
        <xs:choice minOccurs="0" maxOccurs="unbounded">
            <xs:element ref="docbook:inlinemediaobject" />
            <xs:element ref="docbook:remark" />
            <xs:element ref="docbook:superscript" />
            <xs:element ref="docbook:subscript" />
            <xs:element ref="docbook:xref" />
            <xs:element ref="docbook:link" />
            <xs:element ref="docbook:olink" />
            <xs:element ref="docbook:anchor" />
            <xs:element ref="docbook:biblioref" />
            <xs:element ref="docbook:alt" />
            <xs:element ref="docbook:annotation" />
            <xs:element ref="docbook:indexterm" />
            <xs:element ref="docbook:phrase" />
            <xs:element ref="docbook:replaceable" />
            <xs:element ref="docbook:co" />
        </xs:choice>
        <xs:attribute name="role" />
        <xs:attributeGroup ref="docbook:db.common.attributes" />
        <xs:attributeGroup ref="docbook:db.common.linking.attributes" />
        <xs:attribute name="class">
            <xs:simpleType>
                <xs:restriction base="xs:token">
                    <xs:enumeration value="daemon" />
                    <xs:enumeration value="domainname" />
                    <xs:enumeration value="etheraddress" />
                    <xs:enumeration value="event" />
                    <xs:enumeration value="eventhandler" />
                    <xs:enumeration value="filesystem" />
                    <xs:enumeration value="fqdomainname" />
                    <xs:enumeration value="groupname" />
                    <xs:enumeration value="ipaddress" />
                    <xs:enumeration value="library" />
                    <xs:enumeration value="macro" />
                    <xs:enumeration value="netmask" />
                    <xs:enumeration value="newsgroup" />
                    <xs:enumeration value="osname" />
                    <xs:enumeration value="process" />
                    <xs:enumeration value="protocol" />
                    <xs:enumeration value="resource" />
                    <xs:enumeration value="server" />
                    <xs:enumeration value="service" />
                    <xs:enumeration value="systemname" />
                    <xs:enumeration value="username" />
                </xs:restriction>
            </xs:simpleType>
        </xs:attribute>
    </xs:complexType>
</xs:element>