gistfile1.xml

<flow name="orderProcessingFlow">
  <file:inbound-endpoint path="/tmp/demo"/>
  <enricher target="#[variable:OrderType]" source="regex:TYPE=(\w+)\n(?:\n|.)+?">
    <echo-component/>
  </enricher>
  <choice>
    <when expression="#[variable:OrderType = Book]">
      <logger level="INFO" message="BOOK: #[payload]"/>
    </when>
    <when expression="#[variable:OrderType = CD]">
      <logger level="INFO" message="CD: #[payload]"/>
    </when>
    <otherwise>
      <logger level="ERROR" message="Unknown Order Type: #[variable:OrderType]"/>
    </otherwise>
  </choice>
</flow>