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Ontologies is a schema catalog at ontologies.aiql.io. It describes the shape of connected data sources: classes, data properties, and object properties. It does not store the row-level data inside those sources. The catalog holds source types such as databases and APIs. Pointing it at a source URL introspects that source and builds a schema instance others can reuse. This product is distinct from Studio’s in-workspace ontology and reference views. Studio applies ontologies inside a workspace so Observatory can reason. The catalog and introspection API is the Ontologies API.