Here the theme is divided into four classes (Sea-level, Lake, Forest and glacier), each of these categories has its own fill color (Fill color), Glaciers also has a phantom perimeter / outline (Outline Color, Width and Pattern).
To set which surfaces should belong to the different classes used in this example column “objtype” (Classitem) and that in each class entered one expression (Expression) and type of expression (Expression type). In this case, use the type “String”.
The values set are obtained from the characteristic column “objtype” to relevant data sets.
The following is one screen for each class (two for glacier to show that this has two styles).
Example on legend
Example on map