xs:string range 1 to 999

Dear experts!

Do you have an idea how to define a xs:string with the range from 1 to 999?

I tried the following:
<xs:simpleType name="type1-999">
	<xs:restriction base="xs:string">
		<xs:pattern value="\d{1,3}"/>
	</xs:restriction>
</xs:simpleType>

But in my configuration the value 0 is allowed - but I don't want to allow value 0 - du you have an idea?

Thanks
Markus
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