DomainLang Patterns

Standard library of common DDD classifications and metadata keys for DomainLang.

Install

dlang add domainlang/[email protected]

Usage

import "domainlang/patterns"

BoundedContext Orders for Sales as Strategic.CoreDomain {
    description: "Order lifecycle"

    metadata {
        Meta.Status: "Production"
        Meta.Language: "TypeScript"
    }
}

All classifications and metadata keys are exported from the package entry point — import once and use any namespace:

import "domainlang/patterns"

BoundedContext Billing for Finance as Strategic.SupportingDomain {
    metadata {
        Meta.Language: "C#"
        Meta.DeploymentTarget: "Kubernetes"
    }

    decisions {
        decision [Governance.Architectural] CQRS: "Use CQRS for read/write separation"
    }
}

Use an import alias if you prefer a qualified prefix:

import "domainlang/patterns" as Patterns

BoundedContext Orders for Sales as Patterns.Strategic.CoreDomain {
    metadata {
        Patterns.Meta.Status: "Production"
    }
}

Namespaces

Strategic

Domain classifications from Eric Evans' strategic design.

Classification	Description
CoreDomain	The core differentiating capability of the business
SupportingDomain	Supports the core domain but is not a differentiator
GenericSubdomain	Well-understood, can be outsourced or bought off the shelf

Evolution

Wardley Map evolution stages for classifying bounded context maturity.

Classification	Description
Genesis	Novel and poorly understood, requires exploration
CustomBuilt	Better understood but still requires custom implementation
Product	Well-understood, increasingly standardized
Commodity	Highly standardized, utility-like

Archetypes

Bounded context archetypes describing their primary architectural role.

Classification	Description
Execution	Executes core business processes and workflows
Engagement	User-facing, focused on interaction and experience
Analysis	Analytics, reporting, and decision support
Gateway	Integration with external systems and services
Infrastructure	Shared technical infrastructure capabilities
Compliance	Enforces regulatory, legal, or policy requirements

Governance

Decision classifications for tagging decisions, policies, and rules.

Classification	Description
Architectural	System structure, boundaries, integration patterns
Organizational	Team structure, ownership, communication
Technical	Frameworks, libraries, coding standards
Process	Business processes, workflows, procedures

Meta

Common metadata keys for annotating bounded contexts.

Key	Suggested values
Status	Discovery, Development, Production, Sunset, Deprecated
Language	TypeScript, C#, Java, Go, Python, etc.
Repository	URL to source code repository
Documentation	URL to documentation
SLA	99.9%, 99.99%, best-effort
DeploymentTarget	Kubernetes, Serverless, OnPremise, PaaS
APIStyle	REST, gRPC, GraphQL, Messaging, None
DataStore	PostgreSQL, MongoDB, EventStore, DynamoDB, etc.
Criticality	Critical, High, Medium, Low

Author

Created by Lars Baunwall (@larsbaunwall)

License

See LICENSE.