用例图系统之外的参与者，以及他们参与的用例。复制 Markdown查看 Markdown主题KohuKohu DarkDefault用例图目前是 Beta，用 -beta 声明，因为 Mermaid 可能还会修改它。A public library's lending system复制源码在 Playground 中打开Lending system«include»«include»MemberLibrarianSearch the catalogBorrow a bookRenew a loanPlace a holdCheck in a returnAdd a new titleVerify the cardA ride-hailing app复制源码在 Playground 中打开Ride app«include»RiderDriverPayment providerRequest a rideAccept a tripTrack the carPay for the tripRate the tripRide app«include»RiderDriverPayment providerRequest a rideAccept a tripTrack the carPay for the tripRate the tripHelp desk roles that build on each other复制源码在 Playground 中打开«extend»CustomerSupport agentTeam leadOpen a ticketAnswer a ticketEscalate a bugReassign a ticketAn insurance claim as business use cases复制源码在 Playground 中打开Claims officePolicyholderClaims adjuster«Employee»File a claimAssess the damage«Core»Settle the claimPhotos are required forclaims over $2,000A tide gauge reporting its readings复制源码在 Playground 中打开Tide gaugeHarbor forecasterUpload a readingCheck the water levelReadingstationPier 7levelMeters2.84recordedAt06:15 UTCbatteryok上一个矩形树图下一个韦恩图