Fix bare $ref violations to comply with spec Section 3.4.1

Wrap bare $ref usages in { type: { $ref: ... } } format as required by spec.

Author: Clemens Vasters

json-structure-primer.md

@@ -721,8 +721,8 @@ Inline unions extend a common abstract base type and use a selector property:
     "$extends": "#/definitions/Address",
     "selector": "addressType",
     "choices": {
-        "StreetAddress":     { "$ref": "#/definitions/StreetAddress" },
-        "PostOfficeBoxAddress": { "$ref": "#/definitions/PostOfficeBoxAddress" }
+        "StreetAddress":     { "type": { "$ref": "#/definitions/StreetAddress" } },
+        "PostOfficeBoxAddress": { "type": { "$ref": "#/definitions/PostOfficeBoxAddress" } }
     },
     "definitions": {
         "Address": {

samples/core/11-sets-and-maps/schema.struct.json

@@ -70,13 +70,13 @@
           "type": "map",
           "description": "Books indexed by ISBN",
           "keys": { "type": "string" },
-          "values": { "$ref": "#/definitions/Book" }
+          "values": { "type": { "$ref": "#/definitions/Book" } }
         },
         "authors": {
           "type": "map", 
           "description": "Authors indexed by author ID",
           "keys": { "type": "uuid" },
-          "values": { "$ref": "#/definitions/Author" }
+          "values": { "type": { "$ref": "#/definitions/Author" } }
         },
         "categories": {
           "type": "set",

samples/core/12-multiple-inheritance/schema.struct.json

@@ -4,8 +4,7 @@
   "name": "MultipleInheritanceExample",
   "version": "1.0",
   "description": "Demonstrates multiple inheritance using $extends with an array of JSON Pointers",
-  "type": "object",
-  "$ref": "#/definitions/FlyingCar",
+  "$root": "#/definitions/FlyingCar",
   "definitions": {
     "Vehicle": {
       "name": "Vehicle",

samples/import/02-namespace-import/schema.struct.json

@@ -28,7 +28,7 @@
     "items": {
       "type": "array",
       "description": "Order items",
-      "items": { "$ref": "#/definitions/OrderItem" }
+      "items": { "type": { "$ref": "#/definitions/OrderItem" } }
     },
     "totalAmount": {
       "type": { "$ref": "#/definitions/Finance/Money" },

samples/import/04-shadowing/schema.struct.json

@@ -21,7 +21,7 @@
     "paymentMethods": {
       "type": "array",
       "description": "Available payment methods",
-      "items": { "$ref": "#/definitions/FinanceTypes/PaymentMethod" }
+      "items": { "type": { "$ref": "#/definitions/FinanceTypes/PaymentMethod" } }
     }
   },
   "required": ["customerId", "profile"],