1 An actor is a person, organization, or external system that plays a role in one or more interactions with your system. 2  Actors are drawn as stick figures. 3  Associations. 4  Associations between actors and use cases are indicated in use case diagrams by solid lines.
Beauty benefits of walnut oil (Thinkstock photos/Getty Images) High in vitamins and proteins, walnut oil works wonders for your skin. Apart from eating walnuts, the use of it in the form of oil also helps your skin. They are known to be rich in fibre, Omega-3, protein and other vital minerals. Fights wrinkles.
Another kind of walnut oil is the black walnut oil which is obtained from black walnuts, Juglans nigra. Black walnut oil has got its own unique combination of health benefits, which are quite different from the common walnut oil. Black walnut is more of a medicinal herb and its oil too possesses many medicinal properties.