Cairn Documentation

Core building block — system, subsystem, assembly, part, or external actor. Properties bag supports engineering params, evaluation status, narrative cache, and brief data.

Functional, performance, interface, safety, environmental, or constraint requirement scoped to a node.

Connection between two nodes carrying typed signals with protocol, rate, and simulation metadata.

Behavioral state in a node's state machine. Supports timing annotations for simulation.

State transition with guard condition, action, and optional timing parameters.

Test, analysis, demonstration, or inspection record linked to a requirement.

Traceability relationship: satisfies, implements, verifies, derives, depends_on, or custom.

Operational scenario with actors, preconditions, postconditions, and ordered steps.

Key-value engineering parameter with units, category, and source. Stored in node.properties.params[].

Optional dendritic evaluation metadata on nodes for pruned alternatives tracking.