L2-L3 — Logical Concept

Purpose & Usage

Scope

• The L2 -L3 is presented as a rich picture in most cases. Therefore, no information model elements are shown here. However, an L2 -L3 may be constructed with a Node and it’s Needlines. 24.1 Cut-out 24.2 NAFv4 Compliant Example Node Needline 25 L3 - LOGICAL INTERACTIONS Purpose Usage & Concerns Addressed The L3 Viewpoint is concerned with identifying all relevant interactions between Nodes.
• Interoperability requirements. Scope
• Shall contain Logical Interactions between Logical Active Resources relevant to the entity of interest.
• Shall contain the Logical Passive Resources being conveyed by the Logical Interaction.
• May show Logical Interactions to the Needline.
• May show the Nodes relating to the Needlines and the Logical Active Resources they aggregate.
• May show the Logical Passive Resources asked for by the Needline.
• May show the Logical Interaction to Logical Passive Resources.

Representation

Cut-out (Meta-model)

flowchart LR
    Node:::activity
    Node -->|"Needline"| Node
    classDef activity fill:#9DC3E6,stroke:#1F4E79,color:#000

Notes on the Cut-out

The L2-L3 is presented as a rich picture in most cases. Therefore, no information model elements are shown here. However, an L2-L3 may be constructed with a Node and its Needlines.

NAFv4 Compliant Example

flowchart LR
    Coordination["«Node» SAR Coordination Centre"]:::activity
    Patrol["«Node» Maritime Patrol"]:::activity
    Rescue["«Node» Rescue Asset"]:::activity
    Distress["«Node» Vessel in Distress"]:::activity
    N1["«Needline» Distress Signal"]:::activity
    N2["«Needline» Tasking & Coordination"]:::activity
    N3["«Needline» Situational Reporting"]:::activity
    Distress -->|"has"| N1
    N1 -->|"has"| Coordination
    Coordination -->|"has"| N2
    N2 -->|"has"| Patrol
    N2 -->|"has"| Rescue
    Patrol -->|"has"| N3
    N3 -->|"has"| Coordination
    classDef activity fill:#9DC3E6,stroke:#1F4E79,color:#000

Notes on the Example

The original NAFv4 example is presented as a rich picture (an illustrative scenario diagram overlaid on a map). A simplified element-level representation is shown above.