How can one call a WCF service using jQuery retrieving data in XML

This article here on CP is a must read for you: Consuming a WCF / ASMX / REST Service using jQuery[^].

It shows how to achieve each of these possiblities:
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1.Calling an ASMX Web Service using jQuery
2.Calling a WCF Service using jQuery and retrieving data in JSON format
3.Calling a WCF Service using jQuery and retrieving data in XML format
4.Calling a WCF Service using jQuery and retrieving data in JSON format (pass multiple input parameters) and (get multiple objects as output using a DataContract)
5.Calling a WCF Service using jQuery [GET method] and retrieving data in JSON format
6.Calling a REST based WCF Service using jQuery
7.Streaming an image through WCF and requesting it through the HTTP GET verb
"

This article should help you achieve your goal.

Best Regards,