UseCase

Actor.user("User");
Actor.db("Database");

Usecase.dbquery("Query database");
Usecase.auth("Authentification");
Usecase.authA("Authentification by", "username, password");
Usecase.authB("Authentification by", "smartcard");

% simple positioning code not listed, see the manual

drawObjects(user, auth, dbquery, db, authA, authB);

clink(inheritance)(authA, auth);
clink(inheritance)(authB, auth);
clink(association)(auth, dbquery);
clink(association)(user.human, auth);
clink(association)(dbquery, db.human);