[Interaction Use:008]: Covered lifelines

An Interaction Use may extend over a number of lifelines, covering some of them but not all. The lifelines body lines SHALL be visible crossing the interaction use when the lifeline is covered, and it SHALL not be visible when the lifeline is not covered.

The interaction use will be shown as a rectangle that extends from the left side of the most left covered lifeline to the most right covered lifeline. As stated above, the interaction use can extend over non-covered lifeline that happen to be located between two covered lifelines.