First implementation (#1)

Reviewed-on: #1

schemas/draft-ids.schema.json

@@ -0,0 +1,39 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://paperspec.scient.ing/schemas/draft-ids.schema.json",
+  "title": "Draft sentence IDs",
+  "description": "One line of a Typst project's ids.jsonl: scienting-draft-ids/1; spec/21-drafts.md.",
+  "type": "object",
+  "properties": {
+    "id": {
+      "$ref": "common.schema.json#/$defs/nodeId"
+    },
+    "text_hash": {
+      "$ref": "common.schema.json#/$defs/hash"
+    },
+    "section": {
+      "anyOf": [
+        {
+          "$ref": "common.schema.json#/$defs/nodeId"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "ord": {
+      "type": "integer",
+      "minimum": 0
+    },
+    "pinned": {
+      "$ref": "common.schema.json#/$defs/key"
+    }
+  },
+  "required": [
+    "id",
+    "text_hash",
+    "section",
+    "ord"
+  ],
+  "additionalProperties": false
+}