Examples
Worked examples
- Is an instance
BASE (Bielefeld Academic Search Engine) aggregating from thousands of repositories worldwide.
- Is an instance
OpenAlex aggregating publication metadata from Crossref, ORCID, ROR, and crawled sources.
Counter-examples
Looks similar, but isn't
- Not an instance
A single repository serving only its own holdings is not an aggregator.
- Not an instance
A search engine that indexes general web content (without harvesting structured metadata) is not, strictly, a research-information aggregator.
Editorial commentary
Aggregators sit downstream of repositories and CRIS systems. They harvest via OAI-PMH, ResourceSync, REST APIs, and dumps; perform entity deduplication and metadata enrichment; and expose the unified corpus through their own APIs, dashboards, and search interfaces. Aggregators are critical to discoverability — they make the union of millions of small repositories visible as a single corpus — but their dependence on upstream metadata quality means that good repository metadata is what makes aggregators useful.
References
- Knoth P., Pontika N., 'Aggregating Research Papers from Publishers' Systems to Support Text and Data Mining', CORE / Open University working papers.
Also known as
Metadata aggregator · Discovery service
Machine-readable encodings
Use in your systems
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vocab-identifier="https://casrai.org/dictionary/"
vocab-term="Aggregator service"
vocab-term-identifier="https://casrai.org/dictionary/term/aggregator-service" />{
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"@type": "DefinedTerm",
"name": "Aggregator service",
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"description": "A service that harvests, harmonises, and re-exposes metadata and (sometimes) content from many upstream sources, providing a unified search, browse, or query interface across the aggregated corpus; canonical examples include OpenAIRE, BASE, CORE, and OpenAlex.",
"inDefinedTermSet": "https://casrai.org/dictionary/domain/research-data-infrastructure/",
"url": "https://casrai.org/dictionary/term/aggregator-service",
"sameAs": [
"Metadata aggregator",
"Discovery service"
],
"license": "https://creativecommons.org/licenses/by/4.0/"
}
