First implementation (#1)

Reviewed-on: #1

schemas/layer.schema.json

@@ -0,0 +1,89 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://paperspec.scient.ing/schemas/layer.schema.json",
+  "title": "Layer",
+  "description": "layer.json of scienting-layer/1: a W3C AnnotationCollection; spec/18-layers.md.",
+  "type": "object",
+  "properties": {
+    "@context": {
+      "type": "array",
+      "items": {
+        "type": "string",
+        "minLength": 1
+      },
+      "minItems": 2
+    },
+    "format": {
+      "const": "scienting-layer/1"
+    },
+    "id": {
+      "type": "string",
+      "pattern": "^tag:scient\\.ing,2026:layer:[a-z0-9][a-z0-9._-]*/[a-hjkmnp-tv-z][0-9a-hjkmnp-tv-z]{6,25}$"
+    },
+    "type": {
+      "const": "AnnotationCollection"
+    },
+    "label": {
+      "type": "string",
+      "minLength": 1
+    },
+    "purpose": {
+      "type": "string",
+      "minLength": 1
+    },
+    "audience": {
+      "enum": [
+        "novice",
+        "student",
+        "expert",
+        "mixed"
+      ]
+    },
+    "visibility": {
+      "enum": [
+        "private",
+        "team",
+        "public"
+      ]
+    },
+    "license": {
+      "$ref": "common.schema.json#/$defs/license"
+    },
+    "creator": {
+      "$ref": "common.schema.json#/$defs/agent"
+    },
+    "created": {
+      "$ref": "common.schema.json#/$defs/time"
+    },
+    "project": {
+      "$ref": "common.schema.json#/$defs/key"
+    },
+    "docs": {
+      "type": "array",
+      "items": {
+        "$ref": "common.schema.json#/$defs/qualifiedKey"
+      },
+      "minItems": 1,
+      "uniqueItems": true
+    },
+    "total": {
+      "type": "integer",
+      "minimum": 0
+    }
+  },
+  "required": [
+    "@context",
+    "format",
+    "id",
+    "type",
+    "label",
+    "purpose",
+    "visibility",
+    "license",
+    "creator",
+    "created",
+    "docs",
+    "total"
+  ],
+  "additionalProperties": false
+}