http://docs.safe.com/fme/html/FME_Transformers/Default.htm#Transformers/jsontemplater.htm
But I have some values that are in Published Parameters. How would I get those?
I don't see an XQUERY request for that:
http://docs.safe.com/fme/html/FME_Transformers/Default.htm#XQuery/XQuery_functions.htm