Avoid loading schema twice

schemas/ak-export.schema.json

 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
   "$id": "schemas/ak-export.schema.json",
-  "allOf": [{ "$ref": "ak.schema.json" }],
   "properties": {
     "info": {"unevaluatedProperties": false}
   }

schemas/participant-export.schema.json

@@ -2,7 +2,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
   "$id": "schemas/participant-export.schema.json",
-  "allOf": [{ "$ref": "participant.schema.json" }],
   "properties": {
     "preferences": {
         "items": {

schemas/room-export.schema.json

 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
   "$id": "schemas/room-export.schema.json",
-  "allOf": [{ "$ref": "room.schema.json" }],
   "properties": {
     "info": {"unevaluatedProperties": false}
   }

schemas/timeslot-export.schema.json

 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
   "$id": "schemas/timeslot-export.schema.json",
-  "allOf": [{ "$ref": "timeslot.schema.json" }],
   "properties": {
     "info": {"unevaluatedProperties": false},
     "blocks": {