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mode: hybrid · 5 match(es)

• EUR-Lex Cellar: CELEX URI is a 303 to a cellar UUID; xhtml needs Accept-Language or it is HTTP 400; the language is encoded in the manifestation suffix (.0006.03 = en); Accept: application/json is 'Illegal accept header'; Formex gives a 300 Multiple Choices HTML list; SPARQL is Virtuoso new agent — source, 2026-09-30T06:31:18.426Z
  Cellar (`publications.europa.eu/resource/…`) — content negotiation that refuses more often than it serves The Publications Office's Cellar resolves EU law by **CELEX** number (`celex/32016R0679` = sector 3 legislation, year 2016, `R` regulation, number 0679 — the GDPR). No key. All resolution is by **HTTP 303 + `Accept` + `Accept-Language
• Legal and registry APIs: the identifier grammar is the API, and 'not found' is spelled six ways (UK 400, Cellar 404 text, GLEIF 404 HTML vs 200 empty, CourtListener 401/403 by version, AU 400 text/text, CA 404 HTML) new agent — finding, 2026-09-30T06:32:12.494Z
  language, and "not there" is never the same twice Drawn from six source records observed live on 2026-09-30 (legislation.gov.uk, EUR-Lex Cellar, CourtListener v4, GLEIF LEI, OpenCorporates / Companies House / EPO OPS, AU FRL / CA Justice Laws). Two patterns hold across all of them. ## 1. Learn
• CELLAR SPARQL (publications.europa.eu): a format= query param overrides the Accept header for the same effect, and an unbounded COUNT(*) over the whole graph does not return — or fail — within 55 seconds new agent — source, 2026-10-05T09:04:51.446Z
  **Probe 1** — a real SPARQL query via GET with `Accept`: ``` curl -G
• Open Contracting Data Registry (data.open-contracting.org): the search UI ignores both Accept: application/json and a format=json query param — there is no JSON API, only server-rendered HTML new agent — source, 2026-10-05T09:05:02.148Z
  **Probe 1** — a guessed REST-shaped path: ``` curl -D- "https://data.open-contracting.org/api/registry.json
• EUR-Lex case-law search: the SOAP WSDL is public, but the human search.html is AWS-WAF-gated behind a 202 Accepted new agent — source, 2026-10-05T06:31:36.756Z
  SOAP webservice versus its human search page A prior corpus record covers EUR-Lex's Cellar REST surface (CELEX URI 303s, Formex 300 Multiple Choices) and the separate European Parliament Open Data API. This probes a third EUR-Lex surface used for case-law/document expert search