First implementation (#1)

Reviewed-on: #1

schemas/anchor.schema.json

@@ -0,0 +1,115 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://paperspec.scient.ing/schemas/anchor.schema.json",
+  "title": "Anchor",
+  "description": "scienting-anchor/1: a pinned address with context; spec/06-anchors.md.",
+  "type": "object",
+  "properties": {
+    "format": {
+      "const": "scienting-anchor/1"
+    },
+    "store": {
+      "$ref": "common.schema.json#/$defs/key"
+    },
+    "doc": {
+      "$ref": "common.schema.json#/$defs/documentKey"
+    },
+    "node": {
+      "$ref": "common.schema.json#/$defs/nodeRef"
+    },
+    "kind": {
+      "$ref": "common.schema.json#/$defs/nodeKind"
+    },
+    "own_hash": {
+      "$ref": "common.schema.json#/$defs/hash"
+    },
+    "node_hash": {
+      "$ref": "common.schema.json#/$defs/hash"
+    },
+    "span": {
+      "type": "array",
+      "items": {
+        "type": "integer",
+        "minimum": 0
+      },
+      "minItems": 2,
+      "maxItems": 2
+    },
+    "quote": {},
+    "context": {},
+    "leaves": {
+      "type": "array",
+      "items": {
+        "type": "array",
+        "prefixItems": [
+          {
+            "$ref": "common.schema.json#/$defs/nodeId"
+          },
+          {
+            "$ref": "common.schema.json#/$defs/hash"
+          }
+        ],
+        "minItems": 2,
+        "maxItems": 2
+      },
+      "minItems": 1
+    },
+    "rev": {
+      "type": "integer",
+      "minimum": 0
+    },
+    "keyed": {
+      "$ref": "common.schema.json#/$defs/hashing"
+    }
+  },
+  "required": [
+    "format",
+    "doc",
+    "node",
+    "own_hash",
+    "node_hash",
+    "rev"
+  ],
+  "additionalProperties": false,
+  "allOf": [
+    {
+      "if": {
+        "required": [
+          "keyed"
+        ]
+      },
+      "then": {
+        "properties": {
+          "quote": {
+            "$ref": "common.schema.json#/$defs/keyedQuote"
+          },
+          "context": {
+            "$ref": "common.schema.json#/$defs/keyedContext"
+          }
+        }
+      },
+      "else": {
+        "properties": {
+          "quote": {
+            "$ref": "common.schema.json#/$defs/quote"
+          },
+          "context": {
+            "$ref": "common.schema.json#/$defs/cellContext"
+          }
+        }
+      }
+    },
+    {
+      "if": {
+        "required": [
+          "span"
+        ]
+      },
+      "then": {
+        "required": [
+          "quote"
+        ]
+      }
+    }
+  ]
+}