Help to understand xpath expression in camel routebuilder

[Kenneth H]

Hi,

I'm trying to udnerstand a camel example, but I'm stuck at a poit where
xpath is used. The builder is shown here:

public void configure() {
                from(SERVICE_IN) // SERVICE_IN =
jbi:service:http://esbinaction.com/insurance/insuranceDSLRouter
                        .convertBodyTo(DOMSource.class) // Convert to DOM tree
                        .choice()
                                
.when(xpath("//ins:TravelInsuranceRequest").namespace("ins",
"http://dzone.com/insurance";))
                                        .to(TRAVEL_OUT)
                                
.when(xpath("//ins:CarInsuranceRequest").namespace("ins",
"http://dzone.com/insurance";))
                                        .to(LUXURY_CAR_OUT, BUDGET_CAR_OUT)
                                .otherwise()
                                        .to(FAILURE_OUT);
        }

My problem is the "when": what exactly does:

when(xpath("//ins:TravelInsuranceRequest").namespace("ins",
"http://dzone.com/insurance";))

mean? 

Can anybody help me?

Kind regards,
Kenneth H
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