mermaid-example.md

sequenceDiagram
    actor P as Patron
    participant GUI as :CheckoutGUI
    participant DB as :DBMgr
    participant l as l:Loan
    participant d as d:Document
    P->>+GUI: <<uid,cnList>>
    GUI->>+DB:  u:=getUser(uid): User
    GUI-->>P: <msg>
    GUI->>+GUI: [u!=null] process(cnList)
    loop for each cn in cnList
        GUI->>+DB: d:=getDocument(cn): Document
        deactivate DB
        GUI->>+d: a:=isAvailable(): boolean
        deactivate d
        GUI->>l: [a]create(u,d)
        GUI->>+DB: [a]saveLoan(l)
        deactivate DB
        GUI->>+d: [a]setAvailable(false)
        GUI->>+DB: [a]saveDocument(d)
        deactivate DB
    end
    deactivate GUI
    deactivate GUI

sequenceDiagram
    actor P as Patron
    participant GUI as :CheckoutGUI
    participant DB as :DBMgr
    participant l as l:Loan
    participant d as d:Document
    P->>+GUI: <<uid,cnList>>
    GUI->>+DB:  u:=getUser(uid): User
    GUI-->>P: <msg>
    GUI->>+GUI: [u!=null] process(cnList)
    loop for each cn in cnList
        GUI->>+DB: d:=getDocument(cn): Document
        deactivate DB
        GUI->>+d: a:=isAvailable(): boolean
        deactivate d
        GUI->>l: [a]create(u,d)
        GUI->>+DB: [a]saveLoan(l)
        deactivate DB
        GUI->>+d: [a]setAvailable(false)
        GUI->>+DB: [a]saveDocument(d)
        deactivate DB
    end
    deactivate GUI
    deactivate GUI

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