Simple Expression Language to access Map value 
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                 Key: CAMEL-2542
                 URL: https://issues.apache.org/activemq/browse/CAMEL-2542
             Project: Apache Camel
          Issue Type: Improvement
          Components: camel-core
            Reporter: William Tam


Users may want to use Simple Expression Language to evaluate an expression that 
involves Map header values.  For example, the follow expression should evaluate 
to the Map entry value by the key "bar".  The map is the value of an IN message 
header by the name of "foo".

${in.header.foo[bar]}

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