interface-based services can now return the result value as XML object
instead of JSON array or object if TServiceFactoryServer.ResultAsJSONObject is set (can be useful e.g. when consuming services from XML only clients)
- as an alternative, TServiceFactoryServer.ResultAsXMLObjectIfAcceptOnlyXML option will recognize 'Accept: application/xml' HTTP header (exact match) and return XML instead of JSON in this case