First implementation (#1)

Reviewed-on: #1

schemas/stages.schema.json

@@ -0,0 +1,81 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://paperspec.scient.ing/schemas/stages.schema.json",
+  "title": "Stage requirements",
+  "description": "scienting-stages/1: the uses each stage needs; configuration, not code; spec/14-rights.md.",
+  "type": "object",
+  "properties": {
+    "format": {
+      "const": "scienting-stages/1"
+    },
+    "id": {
+      "$ref": "common.schema.json#/$defs/key"
+    },
+    "note": {
+      "type": "string",
+      "minLength": 1
+    },
+    "stages": {
+      "type": "object",
+      "minProperties": 1,
+      "propertyNames": {
+        "$ref": "common.schema.json#/$defs/key"
+      },
+      "additionalProperties": {
+        "type": "object",
+        "properties": {
+          "uses": {
+            "type": "array",
+            "items": {
+              "enum": [
+                "read",
+                "tdm",
+                "redistribute",
+                "quote-public",
+                "accessible-copy"
+              ]
+            },
+            "uniqueItems": true
+          },
+          "ai": {
+            "type": "object",
+            "properties": {
+              "purpose": {
+                "enum": [
+                  "internal",
+                  "external"
+                ]
+              },
+              "processors": {
+                "type": "array",
+                "items": {
+                  "$ref": "common.schema.json#/$defs/processor"
+                },
+                "minItems": 1,
+                "uniqueItems": true
+              }
+            },
+            "required": [
+              "purpose"
+            ],
+            "additionalProperties": false
+          },
+          "note": {
+            "type": "string",
+            "minLength": 1
+          }
+        },
+        "required": [
+          "uses"
+        ],
+        "additionalProperties": false
+      }
+    }
+  },
+  "required": [
+    "format",
+    "id",
+    "stages"
+  ],
+  "additionalProperties": false
+}