Restrictions on attributes

[RwDwR]

I want to achieve the following:

<xs:attribute name=&quot;Unit&quot; >
	<xs:restriction base=&quot;xs:string&quot;>
		<xs:enumeration value=&quot;Degree&quot;/>
		<xs:enumeration value=&quot;Inch&quot;/>
	</xs:restriction>
</xs:attribute>

this is not correct, but w3schools says restrictions on attributes are possible, but doesn't explain how, I've looked some further, but even google displays 3 pages full with useless links....

 

[RwDwR]

oops, appearantly the simpletype tag is not reserved for elements only....

<xs:attribute name=&quot;Unit&quot; >
    <xs:simpleType>
        <xs:restriction base=&quot;xs:string&quot;>
            <xs:enumeration value=&quot;Degree&quot;/>
            <xs:enumeration value=&quot;Inch&quot;/>
        </xs:restriction>
    </xs:simpleType>
</xs:attribute>

that solved my problem...
next time I'll try not to have assumed some things...