@startuml

scale 3

Object "<u>:Administrator" as A
Object "<u>:PosSystem" as P
Object "<u>:Register" as R
Object "<u>:Store" as S

Object "<u>pc:ProductCatalog" as pc
Object "<u>:ProductSpecification" as PS <<collection>> #lightblue
Object "<u>ps:ProductSpecification" as ps


A -r- P : > main()

P -r- S : > 1: create()
S -d- pc : > 1.1: create()
pc -- PS : > 1.1.1: create()
pc -- pc : > 1.1.2: loadProdSpec()
pc -- ps : > 1.1.2.1*: create(itemID, price, description)
pc -- PS : > 1.1.2.2*: add(ps)

S -r- R : > 1.2: create(pc)

@enduml