# 21. Drafts

A draft is a document of kind `draft`, established from a Typst project as a born-digital witness, so every sentence is F2 from the start.
Its sentences cite library sentences by address, in `xref` runs whose targets are addresses in other documents, and its works in `cite` runs whose references resolve to documents.

## 21.1 The snapshot

A snapshot, `scienting-snapshot/1`, is to a Typst draft what a lock file is to a document: a pinned, verified file the compile reads, so a draft renders offline and reproducibly.
It holds the `store`, when it was made, the `quotes` the draft cites (each an address, an anchor, the text, its fidelity and how the anchor resolved), the `claims` (each a reference and pin, with whatever renderings the draft uses) and the `datasets` (each an ID and content hash).

## 21.2 Sentence IDs in a draft

Authors rewrite constantly, and IDs must survive without cluttering the source.
IDs live in a sidecar, `ids.jsonl` in the Typst project, `scienting-draft-ids/1`: one line per sentence with its `id`, its `text_hash`, its `section` and its `ord`, and `pinned` when the author fixed the ID to a label.
Each conversion aligns the new sentences with the previous revision, exact text first and then by edit distance within the section; an edited sentence keeps its ID and gets a new hash, so its annotations reattach or go stale as [6.5](06-anchors.md#65-resolution) says.

Both formats are `provisional` ([0.4](00-introduction.md#04-status)).