TransformProcess process = new TransformProcess();
String definition = "the_geom=the_geom\nnumber=cat";
SimpleFeatureCollection origional = source.getFeatures();
SimpleFeatureCollection result = process.execute( origional, definition );
assertEquals( origional.size(), result.size() );
SimpleFeatureType schema = result.getSchema();
AttributeDescriptor number = schema.getDescriptor("number");