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POS UML Diagrams - Read online for free. POS UML Diagrams Activity Diagram, State Diagram, Usecase Diagram. An example of UML use case diagram for Point of Sale (POS) Terminal or Checkout. A retail POS system typically includes a computer, monitor, keyboard,Construct a design element for Point of sale terminal management system that can be used for buying and selling of goods in the retail shop. When the customer Diagrams. • Use Case. • Activity. • State. • Sequence. • Communication The cashier enters the beverage order into the point-of-sale system (POS). UML DIAGRAM.docx - Free download as Word Doc (.doc / .docx), PDF File An example of UML use case diagram for Point of Sale (POS) Terminal or Checkout.