The fragment operator (in the top left cornet) indicates the type of fragment.A sequence fragment is represented as a box, called a combined fragment, which encloses a portion of the interactions within a sequence diagram.Sequence fragments make it easier to create and maintain accurate sequence diagrams UML 2.0 introduces sequence (or interaction) fragments.The top and the bottom of the rectangle are aligned with the initiation and the completion time respectively. It represents the period during which an element is performing an operation.It shows as tall, thin rectangle on a lifeline).Focus of control: also called execution occurrence, an execution occurrence.An Event is any point in an interaction where something occurs. A comment carries no semantic force, but may contain information that is useful to a modeler.
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