# System.Reflection.Metadata

``` diff
 namespace System.Reflection.Metadata {
+    public sealed class MetadataUpdateHandlerAttribute : Attribute {
+        public MetadataUpdateHandlerAttribute(Type handlerType);
+        public Type HandlerType { get; }
+    }
+    public static class MetadataUpdater {
+        public static bool IsSupported { get; }
+        public static void ApplyUpdate(Assembly assembly, ReadOnlySpan<byte> metadataDelta, ReadOnlySpan<byte> ilDelta, ReadOnlySpan<byte> pdbDelta);
+    }
 }
```

