How can I query a value in SQL Server XML column in SQL Server 2008

I have following XML stored in a XML column in a SQL Server database.

<?xml version="1.0" encoding="UTF-8" ?>
<ns0:Root>
    <ns0:Result>
        <ns0:AStatus>Aaa</ns0:AStatus>
        <ns0:BStatus>Bbb</ns0:BStatus>
    </ns0:Result>
</ns0:Root>

I'd like to get value "Aaa", by firing SQL query.