cataloguecatalog

Cataloguecatalog is a term used in information science to denote a meta-cataloging concept in which catalogs themselves are objects within a central repository. The idea is to create a “catalog of catalogs” that supports cross-catalog discovery, interoperability, and coordinated governance of metadata across distributed systems. It envisions a unified surface for locating and comparing holdings and services across heterogeneous catalog ecosystems.

In practice, a cataloguecatalog system consists of a central hub that stores metadata about individual catalogs, along with adapters or connectors to each source catalog. The hub records metadata schemas, mapping rules, provenance, and identifiers, enabling unified search and automated transformation between different schemas. The approach emphasizes schema-agnostic indexing, traceable lineage of metadata, and the ability to surface information about the catalogs themselves, such as update frequency and access policies.

Key features typically include metadata normalization, cross-reference linking, versioning and provenance tracking, access control, and APIs such as REST or GraphQL. It supports schema mappings, controlled vocabularies, and auditing of changes, aiming to facilitate federation and scalable discovery across domains.

Usage scenarios include library networks that want to unify holdings across institutions, digital repositories aggregating metadata from multiple platforms, and product or museum catalogs requiring cross-domain discovery. While the term appears in academic discussions and pilot projects, it has not led to a widely adopted standard. Implementations are usually research prototypes exploring federation, mapping, and indexing strategies, with challenges in data quality, real-time updates, and complex schema relationships.

See also: union catalog, meta-database, metadata standards, data federation.