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key and keyref problems

Hi all,
I am trying to use key and refkey elements in a XML Schema.

The XML instances look like:

               <country name = "Brasil" code ="BR">
               <country name = "United States of America" code ="USA">
               <country name = "Norway" code ="NO">
               <country code = "NO">
               <country code = "BRAS">

And the XML Schema is (omitting noise with "..."):

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";>
<xs:element name = "travelAgency" ...>

       <xs:key name="countryID">
               <xs:selector xpath="./countries/country"/>
               <xs:field xpath="@code"/>

       <xs:keyref name="countryIDRef" refer="countryID">
               <xs:selector xpath="./travel/country"/>
               <xs:field xpath="@code"/>

The problem is that even wrong XML instances (like the one written
above with BRAS code) are found right by the validator. I have
unsuccessfully tried to change the xpath but I did not succeed.
Searching for inet I found that the namespaces should be added in
xpath declaration but I do not know how to do it, and if it is
necessary in my case.

Thanks in advance,


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