pattern for range of numbers and one fixed number

Hi.

I want to define an element which exepts the number 11 until 109 and the number 999.

The following simple type:
<xs:simpleType name="intzahl">
 <xs:restriction base="xs:integer">
  <xs:minInclusive value="11"/>
  <xs:maxInclusive value="109"/>
  ???
 </xs:restriction>
</xs:simpleType>

How to define the pattern for the value 999?

Thanks
Markus
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