@Test
public void inspectFunctions(){
PMML pmml = createPMML();
assertVersionRange(pmml, Version.PMML_3_0, Version.PMML_4_3);
Apply apply = new Apply()
.setFunction("lowercase");
DefineFunction defineFunction = new DefineFunction("convert_case", OpType.CATEGORICAL, null)
.addParameterFields(new ParameterField(FieldName.create("string")))
.setExpression(apply);
TransformationDictionary transformationDictionary = new TransformationDictionary()
.addDefineFunctions(defineFunction);
pmml.setTransformationDictionary(transformationDictionary);
assertVersionRange(pmml, Version.PMML_4_1, Version.PMML_4_3);
apply.setFunction("uppercase");
assertVersionRange(pmml, Version.PMML_3_0, Version.PMML_4_3);
apply.setFunction(null);
assertVersionRange(pmml, Version.PMML_3_0, Version.PMML_3_0);
}