# Domainmodel Dsl

> Work with the Domain Model DSL (.dmodel) for describing data models — datatypes, entities, and their features. Use when the user wants to create or edit a domain model in this DSL.

- Skill: `typefox/domainmodel-dsl` (Agent Skill)
- Install (CLI): `npx skillmds@latest add typefox/domainmodel-dsl`
- Raw SKILL.md: https://api.skillmd.com/api/skills/typefox/domainmodel-dsl/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- Author: TypeFox (https://skillmd.com/u/typefox)
- Updated: 2026-09-22
- Page: https://skillmd.com/skills/typefox/domainmodel-dsl

---


# Domain Model DSL

A language for describing a data model as a set of datatypes and entities.

## Datatypes

Declare a primitive datatype with the `datatype` keyword:

```
datatype String
datatype Int
```

## Entities

An entity groups a set of features. Each feature has a name and a type:

```
entity Person {
    name: String
    age: Int
}
```

The type of a feature can be a datatype or another entity.

## Packages

You can group declarations inside a package:

```
package model {
    datatype String
    entity Person {
        name: String
    }
}
```

That's the core of the language — declare your datatypes, then your entities with their features.