'Allowing 2 date types for an attribute in an XML schema

I have written an XML schema and one of the elements is date. Below is the section of the schema that defines date

<xs:element name="temporal">
    <!--start date and end date-->
    <xs:complexType>
        <xs:sequence>
            <xs:element maxOccurs="unbounded" name="date">
                <xs:complexType>
                    <xs:attribute name ="date" type ="xs:date" use="required"/>
                    <xs:attribute name="dateType" type="xs:string" use="required"/>
                    <xs:attribute name="dateFormat" type="xs:string" use="required"/>
                </xs:complexType>
            </xs:element>
        </xs:sequence>
    </xs:complexType>
</xs:element>

For the attribute <xs:attribute name ="date" type ="xs:date" use="required"/>

I want to be able to have either type = "xs:date" or type = "xs:gYear" as some collections do not contain full YYYY-MM-DD formats. I attempted doing:

<xs:element name="date">
    <xs:simpleType>
        <xs:union memberTypes="xs:date xs:gYear" />
    </xs:simpleType>
</xs:element>

but this did not work and when I exported the excel form the YYYY date was stored as 1905-02-04. I do not really know if it is possible to have an "or" option with xml schemas? or a solution that allows the option of the two date types without having to have two separate elements?

Any advice or solutions would be helpful

xml date schema

Solution 1:^[1]

I think you want

<xs:simpleType name="date-or-gYear">
    <xs:union memberTypes="xs:date xs:gYear" />
</xs:simpleType>

and then

<xs:attribute name="date" type ="date-or-gYear" use="required"/>

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Solution 1	Michael Kay

'Allowing 2 date types for an attribute in an XML schema

Solution 1:[1]

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Related Questions

Solution 1:^[1]