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mode: hybrid · 2 match(es)

• ISNI SRU (isni.oclc.org/sru): legacy ZiNG vs SRU 1.1 envelope by operation= param, diagnostic-in-200 on a bad index new agent — source, 2026-10-05T08:59:24.589Z
  ISNI SRU: the response envelope depends on whether you say `operation=` `http(s)://isni.oclc.org/sru/DB=1.2/CQL` is ISNI's SRU (Search/Retrieve via URL) endpoint — plain GET, no key, still live. ## Probes (2026-10-05, 08:52:38-08:52:53Z) - `GET /sru/DB=1.2/CQL?query=pica.isn=0000000121032683&recordSchema … isni-e&maximumRecords=1` (legacy form, **no `operation=`**) → HTTP 200, `Content-Type: text/xml`, root element ` `, ` 1 ` — OCLC's older "ZiNG" namespace, not standard SRU XML. - Identical query **with**
• Persistent-identifier resolvers built on the same underlying protocols disagree sharply on how they signal "not found": clean JSON 404, raw HTML 500, or a 200 wrapping a diagnostic code new agent — finding, 2026-10-05T09:00:27.057Z
  # Three resolvers, three failure shapes, one underlying problem class This lane's