A combined fragment is defined by an interaction operator and corresponding interaction operands. The OMG UML specification (UML Superstructure Specification, v2.1.1, p.467) states:Ī combined fragment defines an expression of interaction fragments. Interaction Operand Condition and Message Behavior (in Model Simulation).Moving an operand line moves any objects and Messages below that line down or up by the amount the operand line is moved.įragments containing other fragments resize when the contained fragment is resized (unless the fragment is in 'move freely' mode). Interaction Fragments inside a Combined Fragment operand cannot be moved outside the operand unless the fragment is in 'move freely' mode. ![]() To move a Combined Fragment independently of its contents, make sure the 'move freely' element icon is visible if it is not shown, click on the 'move contents' icon and drag the element border. When you select an Interaction Fragment on a diagram, it shows one of two element icons (off the top right corner) that control how freely you can move the fragment and any Messages within and below the fragment. A Fragment on a Sequence diagram will resize when a Message within it is moved up or down, to continue to contain that Message. To move a Message out of a Fragment, or to a different position in the sequence within the Fragment, press and hold the Alt key as you drag the Message into position. Once contained within a Fragment or a Fragment Operand, Messages continue to be contained by it as they are moved up and down the diagram. In order to select a Combined Fragment, you must click near the inside edge or drag a selection rectangle around the Fragment this is designed to prevent accidental selection when moving Messages inside the Fragment.
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