<?xml version='1.0' encoding="UTF-8" standalone="no" ?>
<!DOCTYPE OPS_envelope SYSTEM "ops.dtd">
<OPS_envelope>
 <header>
  <version>0.9</version>
  </header>
 <body>
  <data_block>
   <dt_assoc>
    <item key="response_code">400</item>
    <item key="response_text">Invalid XML</item>
    <item key="protocol">XCP</item>
    <item key="is_success">0</item>
   </dt_assoc>
  </data_block>
 </body>
</OPS_envelope>