<xsd:element name="unboundControls">
    <xsd:complexType>
        <xsd:sequence>
            <!-- button -->
            <xsd:element name="button" minOccurs="0" maxOccurs="unbounded">
                <xsd:complexType>
                    <xsd:sequence>
                        <xsd:element ref="xsf:ruleSetAction" minOccurs="0" maxOccurs="1" />
                    </xsd:sequence>
                    <xsd:attribute name="name" use="required">
                        <xsd:simpleType>
                            <!-- type of name is non qualified name, but NCName also accepts '.' and '-', 
								so these characters are	disabled by pattern restriction -->
                            <xsd:restriction base="xsd:NCName">
                                <xsd:pattern value="[^\.\^-]*" />
                            </xsd:restriction>
                        </xsd:simpleType>
                    </xsd:attribute>
                </xsd:complexType>
                <xsd:keyref name="button_ruleSetAction" refer="xsf:ruleset_name_key">
                    <xsd:selector xpath="./xsf:ruleSetAction" />
                    <xsd:field xpath="@ruleSet" />
                </xsd:keyref>
            </xsd:element>
        </xsd:sequence>
    </xsd:complexType>
</xsd:element>