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I have an input XML something on this line: <Holding id="12"> <Policy> <HoldingForm tc="1">Individual</HoldingForm> <PolNumber>848433</PolNumber> <LineOfBusiness tc="1">Life</LineOfBusiness> <CarrierCode>67644</CarrierCode> </Policy> </Holding> My manipulation on this XML depends on if <PolNumber> (its an optional element in schema) has a value or not. I'm using Mule 3.3 xpath evaluator to do this and my XPath expression looks this: <expression-filter expression="#[xpath('//acord:Holding/acord:Policy/acord:PolNumber').text != empty]"/> This works fine as long as <PolNumber> element is present or <PolNumber/> is empty element. But if <PolNumber> is absent, above expression throws exception. I tried using XPath boolean function but it returns true for <PolNumber/> . Is there a better way of checking if an element is present and non-empty? EDIT: This is the configuration of namespace manager in my mule config <xm:namespace-manager includeConfigNamespaces="true"> <xm:namespace prefix="acord" uri="http://ACORD.org/Standards/Life/2" /> <xm:namespace prefix="soap" uri="http://schemas.xmlsoap.org/soap/encoding/" /> </xm:namespace-manager>

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