Yes, very clear. And it all works.

Validate -t c:\temp\unique-good.xml c:\temp\unique.xsd

gives

Saxon-SA 8.9N from Saxonica
.NET 1.1.4322.573 on Microsoft Windows NT 5.1.2600.0
Loading schema document file:/c:/temp/unique.xsd
Finished loading schema document file:/c:/temp/unique.xsd
Schema checking successful. Time: 1422 milliseconds
Processing file:/c:/temp/unique-good.xml
Execution time: 70 milliseconds
Validation successful

while

Validate -t c:\temp\unique-bad.xml c:\temp\unique.xsd

gives

Saxon-SA 8.9N from Saxonica
.NET 1.1.4322.573 on Microsoft Windows NT 5.1.2600.0
Loading schema document file:/c:/temp/unique.xsd
Finished loading schema document file:/c:/temp/unique.xsd
Schema checking successful. Time: 371 milliseconds
Processing file:/c:/temp/unique-bad.xml
Validation error on line 13 column 6 of file:///c:/temp/unique-bad.xml:
  Non-unique value found for constraint uniquepreis: (11, 0) (See
  http://www.w3.org/TR/xmlschema-1/#cvc-identity-constraint clause 4.1)
Validation of source document failed 


The only thing I changed was to remove the "..." from your instance
documents, and to add 

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="root" type="root"/>

at the start of your schema, and

</xs:schema>

at the end.

Michael Kay
http://www.saxonica.com/


From markus.gamperl@g... Wed Feb 14 21:05:25 2007
Received: from maggie.w3.org ([19