Domain systems

The engine settles commands, schedules work, and records evidence, but it has no rules of its own for trade, war, or taxes. Domain systems supply those rules. Most of them are domain extensions: optional crates built on canwu-api that you add as dependencies and register as plugins. Register only the systems your application needs; the others take no part in the run. First-party extensions use the same plugin interface as the plugins you write, so you can replace any of them.

A few systems also provide shared types that canwu-api re-exports: knowledge ledgers, decision tickets, route plans, and transport records.

Each system has a design page that covers what it owns, how it runs inside a boundary, and what your application supplies. Routing, military, and technology also have walkthroughs: route planning and delivery, military extension, and technology diffusion.

The systems

Knowledge and informationWhat each actor knows, and how documents and letters are written, sent, read, and understood. Crates: canwu-knowledge, canwu-information, canwu-correspondence.

DecisionsDecision tickets that let a player, an AI, or a policy choose one option, then turn the choice into a checked command that replays exactly. Crate: canwu-decision.

Resources and productionStocks, reservations, transfers, consumption, and loss, plus facilities, work orders, and output. Crates: canwu-resource, canwu-production.

Routing, transport, and movementPlan a route from what one observer knows, record each leg and handoff, and settle movement orders leg by leg. Crates: canwu-routing, canwu-transport, canwu-movement.

MilitaryForces, marches, combat, and occupation, plus effects that other systems settle for an occupied place. Crate: canwu-military.

TechnologyTechniques that move from a workshop trial to local capability, installation, adoption for one use, and teaching at other sites. Crates: canwu-technology, canwu-history-research.

Fiscal institutionsFiscal rules adopted region by region, assessments, authorized collections, audits, and receipts backed by evidence. Crate: canwu-fiscal.

Society, culture, and lawIdeas that spread between population groups, culture content with a lifecycle, and procedures that turn cultural signals into versioned law. Crates: canwu-society, canwu-culture, canwu-law.

Scenarios that combine systems

Most games use several systems at once. The case studies run complete scenarios, such as grain supply for an army or a letter routed from Wuxi to Beijing, and show how the systems hand records to one another.