schema/schema/extent.json in adiwg-json_schemas-0.5.0 vs schema/schema/extent.json in adiwg-json_schemas-0.5.2

@@ -16,11 +16,11 @@
             "enum": ["Feature", "FeatureCollection", "GeometryCollection", "Point", "MultiPoint", "LineString", "MultiLineString", "Polygon", "MultiPolygon"]
           }
         },
         "oneOf": [
           {
-            "$ref": "./geojson/geojson.json#"
+            "$ref": "geojson/geojson.json#"
           }
         ]
       }
     },
     "verticalElement": {
@@ -51,11 +51,10 @@
         }
       }
     },
     "timePeriod": {
       "type": "object",
-      "required": ["beginPosition", "endPosition"],
       "additionalProperties": false,
       "properties": {
         "id": {
           "type": "string"
         },
@@ -66,10 +65,19 @@
           "$ref": "../schema.json#/definitions/date"
         },
         "endPosition": {
           "$ref": "../schema.json#/definitions/date"
         }
-      }
+      },
+      "anyOf": [
+        {
+          "title": "beginPosition required",
+          "required": ["beginPosition"]
+        }, {
+          "title": "endPosition required",
+          "required": ["endPosition"]
+        }
+      ]
     },
     "temporalElement": {
       "type": "object",
       "additionalProperties": false,
       "minProperties": 1,