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//aggregate based on the message content using an XPath expression
//example assumes an XML document starting with <stockQuote symbol='...'>
//aggregate messages based on their symbol attribute within the <stockQuote> element
from("seda:start").aggregate().xpath("/stockQuote/@symbol", String.class).batchSize(5).to("mock:result");

//this example will aggregate all messages starting with <stockQuote symbol='APACHE'> into 
//one exchange and all the other messages (different symbol or different root element) into another exchange.
from("seda:start").aggregate().xpath("name(/stockQuote[@symbol='APACHE'])", String.class).batchSize(5).to("mock:result");