"In an XML Firewall service, JSONx can be used like other XML input."
http://publib.boulder.ibm.com/infocenter/wsdatap/v3r8m1/inde...
"An XML firewall is a specialized device used to protect applications exposed through XML based interfaces like WSDL and REST and scan XML traffic coming in and out of an organization. [snipped] XML Firewall is often used to validate XML traffic, control access to XML based resources, filter XML content and rate limit requests to back-end applications exposed through XML based interfaces."