# Research Ontologies Collection

10 authoritative research ontologies downloaded and verified from W3C, OBO.org, DataCite, and other official sources.

## Quick Reference

| Ontology | File | Size | Source | Category |
|----------|------|------|--------|----------|
| DCAT | dcat.rdf | 195 KB | W3C | Datasets & Catalogs |
| DataCite Schema | datacite-metadata.xsd | 40 KB | DataCite.org | DOI/Research Data |
| BIBO | bibo.rdf | 51 KB | purl.org | Publications |
| Dublin Core | dcterms.rdf | 20 KB | W3C | Metadata |
| PROV | prov.rdf | 166 KB | W3C | Provenance |
| FOAF | foaf.rdf | 43 KB | W3C | Researchers/Projects |
| SKOS | skos-core.rdf | 28 KB | W3C | Knowledge Organization |
| OBO Relations | ro-obo.owl | 1.2 MB | OBO.org | Biology |
| Disease Ontology | doid.owl | 27.7 MB | OBO.org | Chemistry/Biology |
| STATO | stato.owl | 2.2 MB | OBO.org | Lab Protocols |

## Statistics

- **Total Ontologies:** 13 (10 primary + 3 supplementary)
- **Total Size:** 32 MB
- **Total Lines:** 589,000+
- **Formats:** RDF/XML, OWL/XML, XSD, HTML, PDF
- **Authoritative Sources:** 7

## Categories Covered

✓ **Datasets & Data Catalogs** - DCAT, DataCite, Dublin Core  
✓ **Publications & Scholarly** - BIBO, FOAF, SKOS  
✓ **Provenance & Methodology** - PROV, STATO, OBO Relations  
✓ **Domain-Specific** - DOID, NCI Thesaurus, CERIF  

## Download Details

All files downloaded 2026-06-23 from official sources:

- W3C (https://www.w3.org/)
- OBO.org (https://purl.obolibrary.org/obo/)
- DataCite (https://schema.datacite.org/)
- Dublin Core (https://www.dublincore.org/)
- NCI/NIH (https://evs.nci.nih.gov/)
- EuroCRIS (https://www.eurocris.org/)
- purl.org (http://purl.org/ontology/)

See `DOWNLOAD_REPORT.md` for detailed verification and source URLs.
