<xs:element name="keycap">
    <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:choice>
        <xs:attribute name="role" />
        <xs:attributeGroup ref="docbook:db.common.attributes" />
        <xs:attributeGroup ref="docbook:db.common.linking.attributes" />
        <xs:attribute name="function">
            <xs:simpleType>
                <xs:restriction base="xs:token">
                    <xs:enumeration value="alt" />
                    <xs:enumeration value="backspace" />
                    <xs:enumeration value="command" />
                    <xs:enumeration value="control" />
                    <xs:enumeration value="delete" />
                    <xs:enumeration value="down" />
                    <xs:enumeration value="end" />
                    <xs:enumeration value="enter" />
                    <xs:enumeration value="escape" />
                    <xs:enumeration value="home" />
                    <xs:enumeration value="insert" />
                    <xs:enumeration value="left" />
                    <xs:enumeration value="meta" />
                    <xs:enumeration value="option" />
                    <xs:enumeration value="pagedown" />
                    <xs:enumeration value="pageup" />
                    <xs:enumeration value="right" />
                    <xs:enumeration value="shift" />
                    <xs:enumeration value="space" />
                    <xs:enumeration value="tab" />
                    <xs:enumeration value="up" />
                    <xs:enumeration value="other" />
                </xs:restriction>
            </xs:simpleType>
        </xs:attribute>
        <xs:attribute name="otherfunction" />
    </xs:complexType>
</xs:element>