<DocumentDefinition>

  <name>HTTP_Upload_Config</name>

  <element><name>target</name></element>  
  <element><name>from</name></element>  

  <store>
    <name>main</name>    
    <base>config</base>
    <location>Read_only_file:'extension','.config'</location>
  </store>

</DocumentDefinition>