S6 — Service Sequence

Purpose & Usage

The S6 Viewpoint is concerned with identifying the chronological sequence of interactions between services in a scenario.

• Outline requirements for Service behaviour .
• Service implementation guidance.
• Service Orchestration.

Scope

• Shall contain Service Lifelines representing Services.
• Shall contain the Service Interactions between Service Lifelines.
• May show Service Events that trigger Service Interactions.
• May show Service Functions that enable the Service.
• May show Service Interfaces specified by the Service.
• May show Service Operations specified by the Service Interface or relating to the Service Interaction.

Representation

• Sequence Diagram.

Cut-out (Meta-model)

flowchart TB
    ServiceFunction["Service Function"]:::service
    Service:::service
    ServiceInterface["Service Interface"]:::service
    ServiceOperation["Service Operation"]:::service
    ServiceLifeline["Service Lifeline"]:::service
    ServiceInteraction["Service Interaction"]:::service
    ServiceEvent["Service Event"]:::service
    ServiceFunction -->|"enables"| Service
    Service -->|"specifies"| ServiceInterface
    ServiceInterface -->|"specifies"| ServiceOperation
    ServiceLifeline -->|"represents a timeline of"| Service
    ServiceInteraction -->|"is equal to"| ServiceLifeline
    ServiceInteraction -->|"relates to"| ServiceOperation
    ServiceEvent -->|"triggers"| ServiceInteraction
    classDef service fill:#E5C1E5,stroke:#7B4F7B,color:#000

Notes on the Cut-out

The “is equal to” relationship illustrates an objectified relation — the element represents the instantiated form of a connection between other elements.

NAFv4 Compliant Example

flowchart TB
    CoordInterface["«Service Interface» Coordination Interface"]:::service
    RescueInterface["«Service Interface» Rescue Interface"]:::service
    CoordService["«Service» Coordination Service"]:::service
    SARService["«Service» SAR Service"]:::service
    S3Op["«Service Operation» S3 Operation"]:::service
    S2Op["«Service Operation» S2 operation"]:::service
    CoordLifeline["«Service Lifeline» Coordination Service Lifeline"]:::service
    SARLifeline["«Service Lifeline» SAR Service Lifeline"]:::service
    RequestSortie["«Service Interaction» Request Sortie"]:::service
    Acknowledge["«Service Interaction» Acknowledge"]:::service
    CoordService -->|"specifies"| CoordInterface
    CoordInterface -->|"specifies"| S3Op
    SARService -->|"specifies"| RescueInterface
    RescueInterface -->|"specifies"| S2Op
    CoordLifeline -->|"represents a timeline of"| CoordService
    SARLifeline -->|"represents a timeline of"| SARService
    RequestSortie -->|"relates to"| S3Op
    CoordLifeline --> RequestSortie
    RequestSortie --> SARLifeline
    SARLifeline --> Acknowledge
    Acknowledge --> CoordLifeline
    classDef service fill:#E5C1E5,stroke:#7B4F7B,color:#000