Jens U
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Hi, I do Need to restrict an xs:element like the following: <xs:restriction base="xs:string"> <xs:pattern value="[0-9]{9}"></xs:pattern> </xs:restriction> But I have to allow, that it is may empty. The following is not working: <xs:restriction base="xs:string"> <xs:pattern value="[0-9]{0|9}"></xs:pattern> </xs:restriction>