Ontology Builder

The Ontology Builder at frontend/data-workbench/src/components/OntologyBuilder/ provides a visual canvas for designing data ontologies with object types, properties, and relationships.

Components

Component	File	Purpose
`OntologyCanvas`	`OntologyCanvas.tsx`	Main canvas with SVG rendering
`ObjectTypeNode`	`ObjectTypeNode.tsx`	Visual object type box
`ObjectTypeDialog`	`ObjectTypeDialog.tsx`	Create/edit object type dialog
`LinkLine`	`LinkLine.tsx`	Relationship line rendering
`PropertyPanel`	`PropertyPanel.tsx`	Property configuration panel
`Toolbar`	`Toolbar.tsx`	Canvas toolbar (add, delete, layout)

Types

// frontend/data-workbench/src/components/OntologyBuilder/types.ts
interface ObjectType {
  id: string;
  name: string;
  displayName: string;
  description?: string;
  properties: Property[];
  position: { x: number; y: number };
  color?: string;
}
 
interface Property {
  id: string;
  name: string;
  type: 'string' | 'number' | 'boolean' | 'date' | 'reference';
  required: boolean;
  description?: string;
}
 
interface OntologyLink {
  id: string;
  sourceId: string;
  targetId: string;
  label: string;
  cardinality: 'one-to-one' | 'one-to-many' | 'many-to-many';
}

OntologyCanvas

Features:

Drag-and-drop object type creation
Property editor with type selection
Relationship drawing by connecting nodes
Auto-layout algorithms
Zoom/pan controls
Export to OWL/RDF formats
Integration with OntologyApiClient

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