trouble parsing XML

I am able to retrieve the following XML from a web service and assign it to a variable, returnXML. However, I can't figure out how to retrieve the data elements within it. I've tried returnXML.customerProfileID, returnXML.messages.resultCode, etc but they values come back empty.

<createCustomerProfileResponse
xmlns="AnetApi/xml/v1/schema/AnetApiSchema.xsd"
xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <messages>
        <resultCode>Ok</resultCode>
        <message>
            <code>I00001</code>
            <text>Successful.</text>
        </message>
    </messages>
    <customerProfileId>29734345</customerProfileId>
    <customerPaymentProfileIdList/>
    <customerShippingAddressIdList/>
    <validationDirectResponseList/>
</createCustomerProfileResponse>