Product · Schema editor
The T-Box, designed visually.
Classes with typed attributes. Relation types with explicit domain and range. The six SKOS slots — prefLabel, altLabel, hiddenLabel, definition, notation, example — present on every class without configuration.
Classes
Type-safe by default.
A ConceptClass is more than a label. It carries typed attributes (string, number, boolean, enum, date, reference, money), required and localizable flags, and the SKOS slots that downstream consumers expect. Add a class and your schema is the spec.
- Seven attribute types covering most real-world domains
- Required + localizable flags wired into validation
- SKOS-aligned built-ins — never re-declare them
- Color-coded so the canvas stays readable at scale
{
"id": "cc_manufacturer",
"name": "Manufacturer",
"color": "violet",
"properties": [
{ "key": "name", "type": "string", "required": true, "localizable": true },
{ "key": "country", "type": "reference", "required": true },
{ "key": "founded", "type": "date" },
{ "key": "website", "type": "string" }
]
}Relations
Domain and range, enforced.
Every relation type points at a domain class and a range class. The Validation panel surfaces the moment a concept slips out of bounds. The Canvas honors them when you draw a new edge — the picker only shows relation types the endpoints can carry.
- Filtered relation picker on canvas drag-to-connect
- Live domain / range violation warnings
- Built-in transitive `broader` for hierarchical schemes
- Symmetric flag for relations like `relatedTo`
{
"id": "rt_powered_by",
"name": "poweredBy",
"domainClassId": "cc_model",
"rangeClassId": "cc_engine",
"isTransitive": false,
"isSymmetric": false,
"isBuiltIn": false
}The canvas
See the whole shape at once.
A hub-and-spoke ER layout you can drag freely. Built-in `broader` edges dashed. User-defined edges solid violet. Clicking a class opens the inspector with instance counts, custom attributes, and every relation type the class participates in — as domain and as range.
- Single-click selection · double-click to deep-edit
- Click an edge to surface its domain → range pair
- Auto-fit to viewport, manual zoom, no minimap clutter
- Reduced-motion friendly — animations gate on `prefers-reduced-motion`
Design the T-Box you've always wanted.
Free workspace. Cars-style starter pre-loaded. Ten minutes to your first class.