Auto-generate ontology view from OWL/RDFS triples

[paolino]

Problem

When a knowledge map includes a domain ontology (e.g. cardano.ttl with owl:Class, owl:ObjectProperty, rdfs:subClassOf), there is no way to browse the ontology structure in the graph-browser UI. The class hierarchy and property relationships are invisible — only the instance-level graph is rendered.

Currently the only workaround is to manually duplicate ontology classes as gb:Node entries, which drifts from the ontology source of truth.

Proposed solution

When graph-browser detects ontology triples in the loaded RDF, auto-generate a browsable view:

• owl:Class → node (styled by depth in hierarchy)
• rdfs:subClassOf → edge
• owl:ObjectProperty → edge between rdfs:domain and rdfs:range classes
• owl:equivalentClass / owl:equivalentProperty → alignment edges

This should work generically for any OWL/RDFS ontology, not just Cardano-specific.

Context

• cardano-knowledge-maps PR chore(main): release 1.0.0 #22 adds a full domain ontology (cardano.ttl) grounded in W3C vocabularies
• The ontology defines ~40 classes, ~30 properties, alignment mappings to gb: vocabulary
• None of this is visible in the browser — only the gb: instance graph renders