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Implement ESRC-WP-0002/0003/0004: HTML/MD ingest, metadata, recovery

Add ingestHtml and ingestMarkdown with ADR-0003 pageless offset semantics,
PDF intrinsic metadata extraction with caller-wins merge (WP-0003), and
citation recovery primitives including re-ingest reconcile, local quote
search, and pluggable discovery hooks (ADR-0004). Mark all three workplans
finished with contract tests (80 passing).

2026-07-09 01:48:28 +02:00

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SCOPE

This file helps you quickly understand what this repository is about, when it is relevant, and when it is not. It is intentionally lightweight and may be incomplete.

One-liner

Headless document ingest that turns PDF, HTML, and Markdown bytes into engine-owned evidence contracts (fingerprint, canonical text, page/offset maps).

Core Idea

The rest of the citation-evidence ecosystem (anchoring, evidence linking, binders) needs a stable, runtime-agnostic way to go from raw document bytes to a Document + DocumentRepresentation. This repo owns that transformation for PDF, HTML, and Markdown — pure over bytes, no persistence, no viewer, no UI framework.

In Scope

PDF byte ingest → { document, representation } (ingestPdf)
HTML byte ingest → { document, representation } (ingestHtml)
Markdown byte ingest → { document, representation } (ingestMarkdown)
PDF text extraction → canonical text + page map + gap-free offset map (extractPdf)
PDF intrinsic metadata extraction with caller-wins merge (extractPdfMetadata)
SHA-256 byte fingerprinting (fingerprintBytes)
Citation recovery primitives: re-ingest/reconcile, local quote search, discovery hooks
Browser upload helpers behind a separate entry point (createPdfByteStore, ingestPdfFromFile)

Out of Scope

Persisting documents or representations (caller's job)
Viewer URL resolution and blob-vs-fixture policy (stays in citation-evidence)
Stale selector detection and anchor resolution (stays in evidence-anchor)
Network-backed external source discovery implementations (host registers hooks)
Defining domain contracts — those are owned by citation-engine

Relevant When

You have PDF bytes and need engine-shaped evidence contracts
You need a deterministic content fingerprint of document bytes
You are wiring a new consumer to ingest without pulling in a viewer

Not Relevant When

You need formats beyond PDF/HTML/Markdown (not yet implemented)
You need viewer/session/UI behavior (see citation-evidence)
You are changing the Document/DocumentRepresentation contract (see citation-engine)

Current State

Status: active
Implementation: partial (PDF/HTML/MD ingest, metadata enrichment, recovery primitives)
Stability: evolving
Usage: internal (consumed by citation-evidence across the repo boundary)

How It Fits

Upstream dependencies: citation-engine (@citation-evidence/engine/shared)
Downstream consumers: citation-evidence (umbrella app)
Often used with: citation-engine, citation-evidence

Terminology

Preferred terms: ingest, canonical text, fingerprint, representation
Also known as: "source" (its former location was citation-evidence/src/source/)
Potentially confusing terms: "representation" (a derived view of a document, not the document itself)

citation-engine — owns the shared Document/DocumentRepresentation contracts this repo produces
citation-evidence — umbrella app that consumes this ingest core; still owns viewer-url resolution

Getting Oriented

Start with: README.md, then docs/ADR-0001-extraction-boundary.md
Key files / directories: src/pdf/, src/html/, src/markdown/, src/recovery/, src/browser/
Entry points: src/index.ts (headless), src/browser/index.ts (browser)

Provided Capabilities

capability.infotech.pdf-evidence-ingest — headless PDF → evidence contracts (see registry/capabilities/)

Notes

Fixture corpus is owned upstream by citation-evidence and resolved from a sibling checkout (ADR-0002); it is not duplicated here.

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