Ontology Explorer

VS Code extension for visualizing RDF ontologies and DCAT catalogs with SHACL validation.

Publisher: RegexFlow

Action Required — Imre

Please publish v1.0.11 to the VS Code Marketplace.

cd ontology-explorer-vscode
npm install
vsce package
vsce publish

What's new in v1.0.11

• Fixed false-positive "missing labels" in quality report (was reporting 9 issues on KFV ontology, now correctly reports 1)
• Parser now collects skos:prefLabel and skos:definition for label/description detection
• Quality check uses proper label array detection instead of URI fragment comparison
• Added CKAN keyword
• Legend toggles to show/hide node types
• Accessible shapes mode for colourblind users
• Improved colour differentiation for node types

Features

• Network View — Interactive D3 force-directed graph of classes, properties, and relationships
• Hierarchy View — Left-to-right tree layout showing class inheritance and structure
• SHACL Validation — Validate DCAT catalogs against DCAT-AP shapes
• Quality Analysis — Check for common issues (orphan nodes, missing labels, missing domains/ranges)
• Multi-language Labels — Switch between available label languages (e.g. EN, SV)
• Multiple RDF Formats — Turtle (.ttl), RDF/XML (.rdf, .owl), N-Triples (.nt), JSON-LD (.jsonld)
• Jump to Source — Click a node to navigate to its definition in the editor

Usage

1. Open an RDF file (.ttl, .rdf, .owl, .nt, .jsonld)
2. Right-click → "Open Ontology Explorer"
3. Or use Command Palette: Ontology Explorer: Open Viewer

SHACL Validation

1. Open a DCAT catalog file
2. Right-click → "Validate with SHACL (DCAT-AP)"
3. Results appear in the viewer with violations highlighted

UI Layout

┌─────────────────────────────────────────────────┐
│ [Title]     [Network|Hierarchy]    [Check][SHACL]│  ← Toolbar
├─────────────────────────────────────────────────┤
│ ┌─────────┐                                     │
│ │ Legend  │         Graph Area                  │
│ │ ─────── │                                     │
│ │ ● Class │              ●───●                  │
│ │ ● Prop  │            ●       ●                │
│ └─────────┘              ●───●                  │
│                                    ┌───────────┐│
│                                    │Node Detail││
│                                    └───────────┘│
└─────────────────────────────────────────────────┘

• Network — Force-directed graph with drag, zoom, and connection highlighting
• Hierarchy — Tree layout showing subclass/instance relationships
• Check — Quality report (errors, warnings, suggestions)
• SHACL — SHACL validation results (appears after validation)

Updating DCAT-AP Shapes

See SHAPES-UPDATE.md in the extension directory for quarterly update instructions.