<xsd:element name="modified">
    <xsd:annotation>
        <xsd:documentation>This element identifies when a definition was modified and provides details about what modification was made.  A definition can be modified an unlimited number of times.  The unbounded number of optional child contributor elements outline who is credited with the modification.  The required date attribute identifies when the change was actually made.  It is of type date and should be of the form yyyy-mm-dd.</xsd:documentation>
        <xsd:appinfo>
            <cardinality>0-n</cardinality>
            <attributes>date, comment</attributes>
            <content>none</content>
            <parent_elements>dates</parent_elements>
            <child_elements>[contributor]</child_elements>
        </xsd:appinfo>
    </xsd:annotation>
    <xsd:complexType>
        <xsd:sequence>
            <xsd:element ref="oval:contributor" minOccurs="0" maxOccurs="unbounded" />
        </xsd:sequence>
        <xsd:attribute name="date" type="xsd:date" use="required" />
        <xsd:attribute name="comment" type="xsd:string" use="required" />
    </xsd:complexType>
</xsd:element>