Add supported media type list to feature formats

src/ol/format/Feature.js

@@ -76,6 +76,12 @@ class FeatureFormat {
      * @type {import("../proj/Projection.js").default|undefined}
      */
     this.defaultFeatureProjection = undefined;
+
+    /**
+     * A list media types supported by the format in descending order of preference.
+     * @type {Array<string>}
+     */
+    this.supportedMediaTypes = null;
   }
 
   /**

src/ol/format/GMLBase.js

@@ -132,6 +132,8 @@ class GMLBase extends XMLFeature {
       'featureMember': makeArrayPusher(this.readFeaturesInternal),
       'featureMembers': makeReplacer(this.readFeaturesInternal),
     };
+
+    this.supportedMediaTypes = ['application/gml+xml'];
   }
 
   /**

src/ol/format/GeoJSON.js

@@ -82,6 +82,11 @@ class GeoJSON extends JSONFeature {
      * @private
      */
     this.extractGeometryName_ = options.extractGeometryName;
+
+    this.supportedMediaTypes = [
+      'application/geo+json',
+      'application/vnd.geo+json',
+    ];
   }
 
   /**

src/ol/format/KML.js

@@ -489,6 +489,8 @@ class KML extends XMLFeature {
     this.iconUrlFunction_ = options.iconUrlFunction
       ? options.iconUrlFunction
       : defaultIconUrlFunction;
+
+    this.supportedMediaTypes = ['application/vnd.google-earth.kml+xml'];
   }
 
   /**

src/ol/format/MVT.js

@@ -89,6 +89,11 @@ class MVT extends FeatureFormat {
      * @type {string}
      */
     this.idProperty_ = options.idProperty;
+
+    this.supportedMediaTypes = [
+      'application/vnd.mapbox-vector-tile',
+      'application/x-protobuf',
+    ];
   }
 
   /**