64 lines
5.3 KiB
Markdown
64 lines
5.3 KiB
Markdown
# 18. Layers and annotations
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Everything people and models add to a document is an annotation, and annotations are grouped in layers.
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`scienting-layer/1` is the W3C Web Annotation Data Model with the anchor as a selector, so any Web Annotation tool can read it.
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The JSON-LD context is [context/scienting-1.jsonld](../context/scienting-1.jsonld), published at `https://paperspec.scient.ing/context/scienting-1.jsonld`.
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## 18.1 One rule decides what is a claim and what is a layer
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If a statement is true independently of this paper, it belongs in a claim store as a claim, where it is checked and leveled.
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If it is about reading this paper, it belongs in a layer, where it is attributed and signed but not checked.
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## 18.2 The layer
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A layer is a folder with `layer.json` and `annotations.jsonl`.
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`layer.json` is an `AnnotationCollection` with the two contexts, `format`, an `id` of the form `tag:scient.ing,2026:layer:<store>/<record id>`, a `label`, a `purpose`, an `audience` (`novice`, `student`, `expert` or `mixed`), a `visibility` (`private`, `team` or `public`), a `license` (CC BY 4.0 by default when public), its `creator`, `created`, its `project`, the `docs` it annotates and its `total`.
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A reader turns layers on and off, and the audience dial picks the level of glosses.
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## 18.3 The annotation
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Each line of `annotations.jsonl` is a W3C `Annotation`:
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| Property | Holds |
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| --- | --- |
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| `@context` | `["http://www.w3.org/ns/anno.jsonld", "https://paperspec.scient.ing/context/scienting-1.jsonld"]`. |
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| `id` | `tag:scient.ing,2026:annotation:<store>/<record id>` ([4.6](04-identity.md#46-record-ids)). |
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| `type`, `layer` | `Annotation`, and the layer's ID. |
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| `motivation` | A W3C motivation: `commenting`, `describing`, `linking`, `questioning`, `assessing`, `replying` and the others. |
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| `creator`, `created`, `modified` | An agent `{id, type, name}`, with `type` `Person` or `Software`, and times. |
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| `body` | One body ([18.4](#184-bodies)). |
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| `target` | A `SpecificResource` whose `source` is `tag:scient.ing,2026:doc:<store>/<key>` and whose `selector` lists an `AnchorSelector` holding a `scienting-anchor/1`, optionally followed by a W3C `TextQuoteSelector` for tools that do not know ours; or, for a reply, a `SpecificResource` whose source is another annotation. |
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| `status` | `proposed`, `confirmed`, `rejected` or `withdrawn`. A model's annotation is `proposed` until a person confirms it. |
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| `receipt` | For a confirmed annotation, the receipt that covers it. |
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The `TextQuoteSelector`, when present, repeats the anchor quote's `exact`, `prefix` and `suffix`, with an empty string for a `prefix` or `suffix` the quote lacks.
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It is present only when the anchor's quote is plain text; an anchor whose quote is hashed or keyed ([6.3](06-anchors.md#63-keyed-anchors)) has none, so the fallback never shows text the anchor withholds.
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An annotation's content hash is SHA-256 of the canonical JSON of the annotation without `status`, `receipt` and `modified`.
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A confirmed annotation is covered by its confirmer's receipt, which lists `["annotation", <record id>, <content hash>]`.
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Replies are annotations that target annotations, so discussions are threads anchored to sentences.
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## 18.4 Bodies
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| `kind` | W3C type | Adds | Says |
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| --- | --- | --- | --- |
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| `gloss` | `TextualBody` | `audience` | An explanation at `novice`, `student` or `expert` level. |
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| `claim-link` | `SpecificResource` | `source` (`lode:<tag>`), `pin`, `role` | That the span `states`, `uses` or `disputes` a claim. |
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| `symbol` | `SpecificResource` | `source`, `pin`, `symbol` | That this occurrence of a symbol is a symbol claim. |
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| `comment` | `TextualBody` | | A remark, opinion or interpretation. |
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| `caveat` | `TextualBody` | | A warning a reader should see. |
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| `question` | `TextualBody` | `for` | A question for a `reader`, a `group` or the `authors`. |
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| `exercise` | `TextualBody` | `exercise` | A task with a key and a rule ([19](19-exercises.md)). |
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| `citation-context` | `TextualBody` | `reference`, `verdict`, `reason` | Why a sentence cites a reference, and whether it supports it. |
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| `prerequisite` | `SpecificResource` | `source` | What to read or know first. |
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| `crosslink` | `SpecificResource` | `source`, `selector` | That the span corresponds to a span in another document. |
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| `translation` | `TextualBody` | `language` | The span in another language. |
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| `description` | `TextualBody` | `role` | A description of a figure, panel or table for readers who cannot see it: `alt`, a short text equivalent, or `long`, a full description. |
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| `generated` | `TextualBody` | `generator` | Text a model wrote about the span; never mistaken for source. `generator` is `{model, run}` as a correction's model author is ([11.2](11-corrections.md#112-every-correction-records)). |
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A textual body has a `value`, and optionally a `format` (`text/plain` or `text/markdown`) and a `language`.
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Nothing a model writes is ever stored as source text.
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A model may propose a `description`, and like any annotation it stays `proposed` until a person confirms it; an accessible export uses confirmed descriptions only, and a figure with none has no description.
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Other text a model writes about a span, such as a summary, is a `generated` annotation, which names its `generator`.
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`fixtures/records/layer/` holds a layer with one annotation of each common kind and the receipt that confirms some of them.
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