This method is used to instantiate a GML Conversion
setMethod(method)
Sets the method
addParameterValue(paramValue)
Adds a parameter value
delParameterValue(paramValue)
Deletes a parameter value
References
ISO 19136:2007 Geographic Information -- Geographic Markup Language.
http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=32554