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2. Domain Entities 2.3. Parts2.3.1. Atomic and Composite Parts57Example: 5 Container Lines.• We shall presently consider containers (as used in container lineshipping) to be atomic parts.• And we shall consider a container vessel to be a composite partconsisting of– an indexed set of container bays– where each container bay consists of indexed set of container rows– where each container row consists of indexed set of containerstacks– where each container stack consists of a linearly indexed sequenceof containers.• Thus container vessels, container bays, container rows andcontainer stacks are composite parts.A Precursor for Requirements Engineering 57 c○ Dines Bjørner 2012, DTU Informatics, Techn.Univ.of Denmark – July 20, 2012: 12:33