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Mixing mininclusive and enum in xml

I have an xml element whose value range is (essentially) 1-20, so I can use: minInclusive=1

and maxInclusive=20

to constrain the inline set.

<xs:restriction base="xs:integer">
   <xs:minInclusive value="1"/>
   <xs:maxInclusive value="20"/>
</xs:restriction>

However, I also want to set an external value of -4, which has a specific value: "Unknown"

Is it possible? That is, 1-20 and -4 (not -4-20).

I thought I could get away with adding the enum value = -4, but that doesn't seem to work.

<xs:restriction base="xs:integer">
   <xs:enumeration value="-4"/>
   <xs:minInclusive value="1"/>
   <xs:maxInclusive value="20"/>
</xs:restriction>
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1 answer


I think what you need xs:union

is that will allow you to combine the two types of constraints together, for example



<xs:simpleType name="numbersOnetoTwenty">
  <xs:restriction base="xs:integer">
     <xs:minInclusive value="1"/>
     <xs:maxInclusive value="20"/>
  </xs:restriction>
</xs:simpleType>

<xs:simpleType name="justMinusFour">
  <xs:restriction base="xs:integer">
     <xs:enumeration value="-4"/>
  </xs:restriction>
</xs:simpleType>

<xs:simpleType name="mySet">
  <xs:union memberTypes="numbersOnetoTwenty justMinusFour" />
</xs:simpleType>
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