Hello everybody.
I would like to set an uniqueness constraint by checking more than one
attribute.
So:
....
<foo a1="a" a2="a"/>
<foo a1="a" a2="b"/>
<foo a1="a" a2="c"/>
Should be ok.
But:
....
<foo a1="a" a2="a"/>
<foo a1="a" a2="b"/>
<foo a1="a" a2="a"/>
Shouldn't.
How should I write my constraint?
I tried
<xs:unique name="U1">
<xs:selector xpath="tn:foo"/>
<xs:field xpath="@a1"/>
<xs:field xpath="@a2"/>
</xs:unique>
but it doesn't work. Any hint?
Thank you