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Null Integer XSD

Null Integer XSD

Null Integer XSD

I am looking for a way to have XSD where the value is an integer with range [minInclusive, maxInclusive] values but also allow for the integer to be null. ie. <value></value>.

So far I have been able to get an integer element that is allowed to be a null by having it unioned with a string:

<xs:simpleType name="nullInt" final="">
    <xs:union memberTypes="xs:integer">
            <xs:restriction base="xs:string">
                <xs:length value="0"/>

And also an integer with range:

<xs:simpleType name="nullIntRange">
    <xs:restriction base="xs:integer"/>

Where nullIntRange is just a regular integer and the ranges are specified in the element attributes. But is there a way to allow for a null integer with range?  
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