xml schema constraints integer increment

Question

I want to write an XML Schema with an constraint for intgegers. The interger should only be valid with a certain increment.

The basic element could be something like this:

 <xs:element name="MotorFrequency">
        <xs:simpleType>
            <xs:restriction base="xs:integer">
                <xs:minInclusive value="1" />
                <xs:maxInclusive value="2000000" />
            </xs:restriction>
        </xs:simpleType>
    </xs:element>

I need a constraint that only allows an interger with an 4000 increment, like 4000, 8000, 12000 etc.

How can I achieve that?

Answer 1

Only with XSD 1.1 , you could use an <xs:assertion> :

<xs:element name="MotorFrequency">
    <xs:simpleType>
        <xs:restriction base="xs:integer">
            <xs:minInclusive value="1" />
            <xs:maxInclusive value="2000000" />
            <xs:assertion test="($value mod 4000) = 0"></xs:assertion>
        </xs:restriction>
    </xs:simpleType>
</xs:element>

That way, an error will be raised if assertion fails.

Answer 2

If you're stuck with XSD 1.0, then you could write a regular expression

value="[0-9]*(([02468][048])|([13579][26])000"

Not tested.