docs: ADR-0041 — identity is the canonical PURL on typed graph nodes - #413
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Supersedes ADR-0036 after review of the first implementation round (bomly-sdk PRs #13–#15, closed unmerged): the bespoke identity surface — coordinate-fallback grammar, hashed occurrence suffixes, and the 128-bit content address — attracted every hardening round and served no consumer. Identity becomes the canonical PURL on a typed node union (PackageNode requires a valid PURL, type+name mandatory with missing versions warned; ManifestNode is structural), the occurrence qualifier is the existing normalized origin, comparison is an equals/key pair, and contradicting occurrences get deterministic run-local ordinals. The wire keeps the flat node shape plus an additive kind discriminator. Plan item 1.3 rescoped. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThe change adds ADR-0041, marks ADR-0036 as superseded, updates the ADR index and architecture document, and revises the SDK maturity plan around typed graph nodes and canonical PURL identity. ChangesIdentity decision
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🟡 Moderate · up to This documentation-only PR establishes canonical PURL identity and provenance rules, but it leaves credential-bearing qualifier handling, origin merging, and module fallback identity ambiguous. If implemented as written, graphs could expose sensitive URL data or merge unrelated nodes and provenance incorrectly, so clarification and explicit owner acceptance are needed before implementation proceeds. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@dev-docs/adr/0041-identity-is-the-canonical-purl-on-typed-nodes.md`:
- Around line 68-72: Update the ADR section describing deterministic ordinal
suffixes to specify the starting ordinal and that numbering resets independently
for each canonical PURL identity key. Add golden vectors demonstrating these
rules for contradicting occurrence sets, including the resulting IDs and sorted
assignment order.
- Around line 31-35: Update normalizeSBOMGraphIdentity so imported PURLs are
validated or sanitized before being assigned to clone.ID, excluding sensitive
qualifiers from published node IDs while preserving the canonical type-and-name
requirement. Add focused tests covering safe and sensitive PURL qualifiers
before adopting the ADR’s identity behavior.
- Around line 61-66: Update ADR 0041 to explicitly define equals and key
behavior for ManifestNode: either state that both APIs exclude manifest nodes,
or specify a kind-scoped path-based key and matching behavior so manifest roots
are handled consistently during consolidation and map grouping.
- Around line 49-51: The ADR’s GraphNode wire contract must define the allowed
kind discriminator values and precedence when kind conflicts with package-type,
including legacy payload inference and unknown values. Update the GraphNode
protocol documentation to make classification deterministic for independent
bomly.plugin.v1 implementations, and add frozen fixtures covering explicit,
legacy, unknown, and conflicting payloads.
In `@dev-docs/SDK_MATURITY_PLAN.md`:
- Line 143: Update the SDK maturity plan to remove all superseded ADR-0036
identity and content-address requirements: revise the identity requirements
around lines 103-106, the CLI identity reference near line 160, and the
definition of done near lines 204-206 to consistently describe ADR-0041’s
canonical-PURL, normalized-origin, and deterministic ordinal model.
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| norm and its absence is visible, not fatal. | ||
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| **Graph nodes are a typed union.** The graph holds a sealed `GraphNode` | ||
| interface with two concrete types: a package node, which must carry a valid |
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Refrain from using "package" node not to confuse it with registry packages (after matching). We can use "dependency" nodes instead.
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Renamed throughout in 834eebe: the union is manifest / module / dependency nodes — the ADR now states explicitly that graph records avoid the word "package" because that is the registry artifact matching produces.
🤖 Addressed by Claude Code
| norm and its absence is visible, not fatal. | ||
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| **Graph nodes are a typed union.** The graph holds a sealed `GraphNode` | ||
| interface with two concrete types: a package node, which must carry a valid |
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Since we are refactoring the graph model, now is a good time to make it concrete yet flexible enough to work with our different use cases. That being said, consider more node types to support different concepts the CLI deal with today: manifest > root dependency (the project itself) > dependencies, but also manifest > module > child modules > child manifests > dependencies. Figure out a way to cleanly capture those two different cases.
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Addressed in 834eebe: the union grows to three kinds — manifest, module (the project's own root and every workspace/reactor module; first-party ownership becomes the kind itself), and dependency — and the ADR shows both shapes as plain edge patterns over them: manifest → module → dependencies, and manifest → module → child manifest → child module → … nesting as deep as the build does. No fourth kind needed.
🤖 Addressed by Claude Code
| standard and `purlkit` (backed by `package-url/packageurl-go`) is its one | ||
| home; identity introduces no second grammar beside it. A package node's | ||
| identity is valid only when a canonical PURL with at least a type and a | ||
| name is derivable; a node that cannot produce one is rejected at the |
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We should always follow industry standards. In this case, follow PURL standards which states that at minimum scheme, type, and name are required, but specific types can define more requirements. For example, maven also requires the orgID in addition to the artifactID (name).
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Addressed in 834eebe: validity now delegates entirely to the PURL specification via packageurl-go — scheme, type, and name at minimum plus each type's own requirements (Maven's group-ID namespace named as the example); Bomly adds no validity rule of its own. The single Bomly policy on top is the version warning, since the spec leaves version optional.
🤖 Addressed by Claude Code
…led contracts The union grows to what the CLI actually models, in reviewer-directed vocabulary: manifest, module (the project's own root and workspace artifacts — first-party ownership becomes the kind, not a boolean), and dependency nodes, with both project shapes (manifest→module→dependencies and nested workspace manifests) as plain edge patterns. Dependency-node validity delegates entirely to the PURL specification via packageurl-go — scheme+type+name plus each type's own rules — with missing versions warned as the one Bomly policy. The identity relation is now kind-scoped with the ADR-0033 three-way origin rule (equal folds, gap fills, different coexists), which also makes cross-kind folds impossible by construction. Specified: the identity-form qualifier gate for published IDs, ordinal start/scope/order, and the wire kind discriminator (authoritative when present, deterministic legacy inference, unknown = decode error, four frozen fixtures). Every remaining ADR-0036 identity reference in SDK_MATURITY_PLAN.md is rescoped. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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…uffixes hash the origin Three reviewer-directed corrections. Qualifiers stay in published IDs — the PURL spec defines them as qualifying data and container scans carry one package/version under two architectures — with only the spec's URL-valued evidence keys (repository_url, download_url, vcs_url) stripped to Origin behind the ADR-0033 gates. An unknown origin is its own occurrence, never a gap consolidation fills (manufacturing provenance); ecosystem detectors may fill gaps at detection time where their semantics justify it. Occurrence suffixes derive from a short hash of the occurrence's own normalized origin, stable under occurrence-set changes where positional ordinals would renumber published bom-refs; run-local ordinals remain only for the rare raw-evidence-only contradictions, with the run-scoped caveat stated. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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…d, ref semantics industry-aligned Evidence-qualifier redirection is defined as passing through the ADR-0033 origin constructors, which reject signed or tokenized links outright — nothing is sanitized into publication. Module identity always includes the declaring manifest path, so a recursive scan's two unrelated same-name projects can never fold. Readable-ID stability is scoped the way the major SBOM formats scope it: CycloneDX bom-refs and SPDX element IDs are document-local handles, cross-run identity lives in the data fields, and the singleton-keeps-bare-PURL choice is recorded with the rejected alternative. The architecture narrative now points at ADR-0041. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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The maintainer's usefulness-over-complexity review lands: the occurrence machinery served a same-manifest multi-source corner resolvers do not produce, and every other SCA model (GitHub, Syft, Snyk, CycloneDX evidence.occurrences) treats origin as evidence on one identity. Dependency nodes now carry an Origins list, union-merged and never an identity term; suffixes, ordinals, ephemeral discriminators, contradiction finalization, and the origin comparison term are all deleted from the design; node IDs are the canonical PURL itself, unique by construction. Cross-manifest attribution stays with the per-entry graphs, a multi-origin list becomes a displayable dependency-confusion signal, and ADR-0033 is narrowed to its publication gates. Plan references rescoped. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Inline comments:
In `@dev-docs/adr/0041-identity-is-the-canonical-purl-on-typed-nodes.md`:
- Around line 99-105: Verify the qualifier filtering used by the canonical
PURL/identity normalization path, especially around the ADR-0033 origin
constructors and the URL-valued keys repository_url, download_url, and vcs_url.
Enforce a closed allowlist so unrecognized, custom, or future
qualifiers—including secret-bearing values—cannot enter published graph IDs; add
fixtures covering custom and credential-bearing qualifiers if coverage is
absent.
- Around line 163-164: Update the ADR to define the decoder behavior when both
singular origin and plural origins are present, including precedence or union
semantics, deduplication, and whether the combination is rejected. Add a fixture
covering both fields together that verifies the specified behavior.
- Around line 135-136: Update the identity fallback wording near the
recursive-scan discussion to use the declaring manifest path when a module
cannot produce a PURL, replacing the name-based fallback and aligning it with
the path-based identity rule established earlier and in SDK_MATURITY_PLAN.md.
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… projections, edge-union recorded Identity qualifiers narrow to the specification's known keys (registered plus type-documented; unrecognized custom keys drop with a warning — an imported document can invent a token-bearing qualifier, and IDs are published); ADR-0033 gains the amendment note recording that the artifact form rejects query-carrying URLs rather than stripping them. Module fallback identity is consistently declaring-manifest-path plus name, all identity paths are canonical repository-relative slash-separated forms enforced by SDK constructors, and path-based IDs render kind-qualified so a PURL-less module and its declaring manifest never share a published ID. Reference semantics are format-aware: bom-ref carries the PURL directly, SPDX keeps its idstring projection with collision mapping as a format-local rendering. Dual origin/origins payloads decode as a deduplicated union with a pinned fixture. The PURL-fold edge-union trade-off is recorded as a deliberate consequence with its test-expectation change named. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
… kind inference Legacy payloads infer module only from the first-party marker; an application-typed component without it stays a dependency node, matchable and enrichable, per ADR-0015 — inferring ownership from the type would silently exempt imported SBOM applications from matching and hide their vulnerabilities. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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…tripping relocates the Scorecard signal Registry-match eligibility becomes node-level with an any-witness rule when occurrences fold (withholding enrichment would hide vulnerabilities; the reverse merely enriches a PURL the registry also serves) — recorded as a narrowing of ADR-0015, with per-source observations kept in the origins list. Qualifier stripping is defined as relocation, not deletion: the Scorecard matcher's repository resolution reads exactly these keys today, so it receives the vetted origin signal projected onto the match request, and the plan marks its adoption bump as behavioral rather than mechanical. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Records the identity redesign decided after reviewing the first implementation round (bomly-sdk #13/#14/#15, closed unmerged).
What changed and why
The ADR-0036 mechanism — coordinate-fallback grammar, hashed occurrence suffixes, length-prefixed facet encoding, 128-bit content address — proved robust under review and unnecessary in equal measure: every hardening round attached to the bespoke surface, and no consumer reads the address. Per the standing delegation principle, identity now rides the industry standard instead of a private grammar beside it:
GraphNodewithPackageNode(valid PURL enforced at construction) andManifestNode(structural, path-identified, never matched). In-process breaking under v0 policy; the wire keeps flat node JSON plus one additiveomitemptykind discriminator. (A genericGraph[N]was considered and rejected — detection graphs are heterogeneous and Go generics have no sum types.)o2) only when contradicting occurrences coexist. No hash suffixes; raw evidence never reaches an ID.ADR-0036 is marked superseded, the index is updated, and
SDK_MATURITY_PLAN.mditem 1.3 is rescoped. The replacement SDK stack follows as fresh, smaller PRs; the review-hardened invariants from the closed round return as tests.🤖 Generated with Claude Code
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