evidence-source/docs/ADR-0003-html-markdown-representation.md
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Clarify structureMap is populated by anchor viewers, not ingest
Align ADR-0003 with promoted StructureMap contract in citation-engine.
2026-07-09 09:18:46 +02:00

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# ADR-0003 — HTML and Markdown representation contract
- **Status:** accepted
- **Date:** 2026-07-09
- **Workplan:** ESRC-WP-0002 (T01)
## Context
ESRC-WP-0001 established the PDF ingest boundary. ESRC-WP-0002 extends ingest to
HTML and Markdown while reusing engine-owned contracts from
`@citation-evidence/engine/shared`.
`RepresentationType` already reserves `html-dom` and `markdown-rendered` in
`citation-engine`; no engine schema change is required for this slice.
## Decision
### Representation types
| Source format | `mediaType` | `representationType` |
| ------------- | ------------------ | ---------------------- |
| HTML | `text/html` | `html-dom` |
| Markdown | `text/markdown` | `markdown-rendered` |
### Pageless offset semantics
Reflowable formats have no fixed pages:
- `pageMap` is **omitted** (undefined).
- `offsetMap` is a **single synthetic range** on page 1 covering
`[0, canonicalText.length)` with no gaps. This keeps
`TextPositionSelector` usable without inventing physical page geometry.
- `structureMap` is omitted by ingest; viewer adapters in `evidence-anchor`
may populate it at selection time (see `SharedContracts.md` §3).
### Canonical text
Both pipelines decode source bytes as UTF-8, derive plain text from the format,
then apply `normalize()` from `@citation-evidence/engine/shared`. HTML strips
active content (`script`, `style`, `iframe`, `object`, `embed`, `noscript`)
before text extraction.
### Content hash
`contentHash` is the SHA-256 fingerprint of the **source bytes** (same rule as
PDF ingest), not a hash of canonical text.
### Fixtures
HTML/Markdown contract tests use small inline fixtures owned by this repo. They
contain no PII and do not duplicate the upstream PDF corpus (ADR-0002).
## Consequences
- `ingestHtml` and `ingestMarkdown` mirror the PDF `{ document, representation }`
shape.
- Anchoring layers may add DOM/structural selectors later; this slice delivers
canonical text and position offsets only.
- Sanitization is extraction-time stripping, not a sandboxed renderer.