Schema substitution issues fixed

schema/Entity.json

@@ -157,7 +157,7 @@
         "operationSpace": {
           "$ref": "#/definitions/GeoProperty"
         },
-        "$id": {
+        "id": {
           "type": "string",
           "format": "uri"
         },

schema/Entity_keyValues.json

@@ -5,7 +5,7 @@
   "description": "NGSI-LD Entity Simplified Representation",
   "type": "object",
   "properties": {
-    "$id": {
+    "id": {
       "type": "string",
       "format": "uri"
     },

schema/common.json

@@ -70,7 +70,7 @@
     "EntityInfo": {
       "type": "object",
       "properties": {
-        "$id": {
+        "id": {
           "type": "string",
           "format": "uri"
         },

schema/registrations/ContextSourceNotification.json

@@ -5,7 +5,7 @@
   "description": "NGSI-LD Context Source Notification",
   "type": "object",
   "properties": {
-    "$id": {
+    "id": {
       "type": "string",
       "format": "uri"
     },

schema/registrations/ContextSourceRegistration.json

@@ -116,7 +116,7 @@
         {
           "type": "object",
           "properties": {
-            "$id": {
+            "id": {
               "type": "string",
               "format": "uri"
             },

schema/subscriptions/Notification.json

@@ -5,7 +5,7 @@
   "description": "NGSI-LD Notification",
   "type": "object",
   "properties": {
-    "$id": {
+    "id": {
       "type": "string",
       "format": "uri"
     },

schema/subscriptions/Subscription.json

@@ -132,7 +132,7 @@
         {
           "type": "object",
           "properties": {
-            "$id": {
+            "id": {
               "type": "string",
               "format": "uri"
             },

schema/temporal/EntityTemporal.json

@@ -31,7 +31,7 @@
           },
           "minItems": 1
         },
-        "$id": {
+        "id": {
           "type": "string",
           "format": "uri"
         },

schema/temporal/Entity_temporalValues.json

@@ -83,7 +83,7 @@
   },
   "type": "object",
   "properties": {
-    "$id": {
+    "id": {
       "type": "string",
       "format": "uri"
     },