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Syntax (ch. 4), qualifiers (ch. 6) and SWH preference for dir ids not re-read (producer).\n\nLimitations: Specs/APIs read 2026-10-22; no SWHID computed; CDX observation is a single live query.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://github.com/swhid/specification/blob/91af30def821fa768de1d32cb02309805ad652af/Chapters/5.Core_identifiers.md","note":"swhid/specification Chapters/5.Core_identifiers.md at 91af30d"},{"url":"https://github.com/swhid/specification/blob/91af30def821fa768de1d32cb02309805ad652af/Chapters/6.Qualified_identifiers.md","note":"swhid/specification Chapters/5.Core_identifiers.md at 91af30d"},{"url":"https://github.com/swhid/specification/blob/91af30def821fa768de1d32cb02309805ad652af/Chapters/4.Syntax.md","note":"swhid/specification Chapters/5.Core_identifiers.md at 91af30d"},{"url":"https://docs.softwareheritage.org/devel/swh-model/persistent-identifiers.html","note":"swhid/specification Chapters/5.Core_identifiers.md at 91af30d"}]},"tags":[],"type":"article","links":[],"title":"What are the five SWHID object types and what exactly is hashed for each, so I can tell what a given swh:1:... string identifies?","rights":[{"notes":"Applies to this original summary only, not to the cited sources.","hosting":"permitted","component":"documentation","license_id":null,"modification":"unknown","evidence_urls":[],"model_training":"unknown","redistribution":"permitted"}],"summary":"SWHID core identifiers are SHA-1 hashes over Git-style serializations: content ids hash only the file bytes behind a 'blob' header (no file name), directories hash sorted entries with modes, and revisions/releases also hash metadata such as author, committer, timestamps and message, so the same tree committed twice yields different revision ids but the same directory id; Git compatibility is described as incidental, not guaranteed.","evidence":{"claims":[{"url":"https://github.com/swhid/specification/blob/91af30def821fa768de1d32cb02309805ad652af/Chapters/5.Core_identifiers.md","claim":"SWHID core identifiers are SHA-1 hashes over Git-style serializations: content ids hash only the file bytes behind a 'blob' header (no file name), directories hash sorted entries with modes, and revisions/releases also hash metadata such as author, committer, timestamps and message, so the same tree committed twice yields different revision ids but the same directory id; Git compatibility is described as incidental, not guaranteed.","locator":"swhid/specification Chapters/5.Core_identifiers.md at 91af30d","classification":"sourced_fact"}],"review":"unreviewed","execution":"not_run","inspection":"source_inspected","execution_record_ids":[]},"language":"en","categories":["T16","T20"],"extensions":{"curation/v1":{"curator":"CURATOR-A-20261021","revision":1,"topic_ids":["CAT:T16.06","CAT:T20.03"],"confidence":"Low.","limitations":["Specs/APIs read 2026-10-22; no SWHID computed; CDX observation is a single live query.","Source pin hashes are native catalogue descriptor hashes, not upstream byte hashes. 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