Ontology
XAO
Xenopus Anatomy Ontology
XAO represents the anatomy and development of the African frogs Xenopus laevis and tropicalis.
Source & access
Homepagexenbase.org
Repositorygithub.com
DownloadCanonical file / PURL
Browse in OLSEMBL-EBI Ontology Lookup ServiceBrowse in BioPortalNCBO BioPortalBrowse in OBO FoundryOBO Foundry registry
- homepage xenbase.org HTTP 429
- repository github.com HTTP 200
- download purl.obolibrary.org HTTP 200
Portals & registries
| Source | ID | Version | Classes | Properties | Individuals | Loaded |
|---|---|---|---|---|---|---|
| OLS (EMBL-EBI) | xao | 2024-09-03 | 1,830 | 43 | 0 | 25 Oct 2026 |
| OBO Dashboard | xao | 2024-09-03 | 1,830 | — | — | 11 Dec 2025 |
Ontology IRI http://purl.obolibrary.org/obo/xao.owl
Version IRI http://purl.obolibrary.org/obo/xao/releases/2024-09-03/xao.owl
Languages en
Reused by (1)
XPO
- Logical consistency
- consistent · 0 unsatisfiable
- OWL 2 DL
- yes
- ROBOT report
- 0 errors · 10 warnings · 2 info
- OBO principles
- FP01FP02FP03FP04FP05FP06FP07FP08FP09FP11FP12FP16FP20
- Axioms
- 20,315 · 2.03% entities reused
Also registered as
aberowl: XAO bioportal: XAO fairsharing: FAIRsharing.17zapb obofoundry: xao ols: xao ontobee: XAO wikidata.entity: Q42400040
Automated evaluation
F Findable FAIR12/12
- Persistent identifier (F1)purl.obolibrary.org+4
- Indexed in services (F4)5: OLS, BioPortal, OBO Foundry, Bioregistry, FAIRsharing+5
- Citable reference (F2)doi:10.1186/2041-1480-4-31+3
A Accessible FAIR12/12
- Homepage reachableHTTP 429+3
- Artefact retrievable over HTTP(S) (A1)download HTTP 200+6
- Metadata persists in a registry (A2)OBO Foundry, Bioregistry+3
I Interoperable FAIR12/12
- Formal machine-readable format (I1)OWL, OBO+5
- Semantic-web IRIs (I2)OWL, OBO+3
- References other vocabularies (I3)imports 3: iao, omo, ro+4
R Reusable FAIR11/12
- Clear license (R1.1)CC BY 3.0+5
- Release provenance (R1.2)2024-09-03 (version IRI in the artefact)+4
- Community standards (R1.3)OBO principles: 9/13 checks pass+2
Q Ontology consistency & quality17/20
- Logical consistencyconsistent, 0 unsatisfiable classes (OBO Dashboard)+10
- OWL 2 DL profilein OWL 2 DL+2
- Upper-ontology alignmentno BFO/COB/DOLCE import found0
- Standard relations (RO)imports RO+1
- ROBOT report: no errors0 errors+2
- ROBOT report: warning density10 warnings / 1830 classes = 0.01+1
- Pitfall scan: no critical pitfallsno pitfall scan yet; ROBOT report has 0 errors+1
M Maintenance10/16
- Recency2026-10-16 → 0.3 months (≤ 3 months)+10
- Release cadence (12 months)0 releases (GitHub releases)0
U Community adoption5/16
- Documented adopting projects1 project+2
- Reused by other ontologies1: xpo+1
- Community signalmax(stars 8 → 1, citations 50 → 2)+2
P Penalties (inactivity & inconsistency)0
- Time since last activity0.0 years → 4 × max(0, 0.0 − 1)0
- Inactive statusnot archived, legacy or inactive0
- Consistencyconsistent, no unsatisfiable classes0
FAIR subtotal 47/48 · earned 79/100 = 79/100 → grade B
Community adoption 1
- xenbase.org
Xenbase uses XAO to annotate gene expression.
Source: OBO Foundry registry
Know a project that uses XAO? Suggest it.
History & changes 1 run
History starts with the first archived run; changes appear after the next evaluation.
| Run | Score | FAIR | Version evaluated | Terms | Snapshot |
|---|---|---|---|---|---|
| 26 Oct 2026, 03:31 UTC | 79 B | 47 | 2024-09-03 | 1,830 | JSON |
Provenance
Every fact on this page was fetched automatically. Each row shows where it came from and when. If a source fails, the last good value is kept and marked “carried forward”.
| Fact | Source | Retrieved |
|---|---|---|
| Homepage link check (HTTP 429) | xenbase.org | 26 Oct 2026, 03:30 UTC |
| Repository link check (HTTP 200) | github.com | 26 Oct 2026, 03:30 UTC |
| Download link check (HTTP 200) | purl.obolibrary.org | 26 Oct 2026, 03:30 UTC |
| Artefact header (version IRI) | raw.githubusercontent.com | 26 Oct 2026, 03:30 UTC |
| Git refs (commit 5dcc024, latest tag v2024-09-03) | github.com | 26 Oct 2026, 03:30 UTC |
| GitHub repository statistics | api.github.com | 26 Oct 2026, 03:30 UTC |
| OLS classes, imports, version & release | ebi.ac.uk | 26 Oct 2026, 03:30 UTC |
| OBO Foundry status, license & usages | obofoundry.org | 26 Oct 2026, 02:37 UTC |
| Bioregistry mappings, dependencies & reuse | bioregistry.io | 26 Oct 2026, 03:30 UTC |
| OBO Dashboard (checked 11 Dec 2025) | dashboard.obofoundry.org | 26 Oct 2026, 02:37 UTC |
| Crossref citations (doi:10.1186/2041-1480-4-31) | api.crossref.org | 26 Oct 2026, 03:30 UTC |
| Crossref citations (doi:10.1186/1471-213x-8-92) | api.crossref.org | 26 Oct 2026, 03:30 UTC |
Run 2026-10-26T02-37-38Z · evaluator v2.0.0 · rubric v3.4 · entry.json · run snapshot
How to cite
- Enhanced XAO: the ontology of Xenopus anatomy and development underpins more accurate annotation of gene expression and queries on Xenbase (2013) · doi:10.1186/2041-1480-4-31 · 44 citations
- An ontology for Xenopus anatomy and development (2008) · doi:10.1186/1471-213x-8-92 · 50 citations