<env:Envelope xmlns:xsd=“www.w3.org/2001/XMLSchema” xmlns:xsi=“www.w3.org/2001/XMLSchema-instance” xmlns:tns=“thomas-bayer.com/blz/” xmlns:env=“www.w3.org/2003/05/soap-envelope”>

<env:Body>
  <tns:getBank>
    <tns:blz><%= test_values[:blz] || '70070010' %></tns:blz>
  </tns:getBank>
</env:Body>

</env:Envelope>