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    <from uri="seda:orders">
       <filter>
           <simple>in.header.foo</simple>
           <to uri="mock:fooOrders"/>
       </filter>
    </from>
{code:xml}

The Simple language can be used for the predicate test above in the filter, where we test if the in message has a {{foo}} header (a header with the key {{foo}} exists). If the expression evaluates to *true* then the message is routed to the {{mock:foo}} endpoint. And for *false* it is of course routed to {{mock:bar}} endpoint.

The same example in Java DSL:
{code:java}