namespace System.ComponentModel.Composition.Hosting
{
    [DebuggerTypeProxy(typeof(CompositionScopeDefinitionDebuggerProxy))]
    public class CompositionScopeDefinition : ComposablePartCatalog, INotifyComposablePartCatalogChanged
    {
        protected virtual void OnChanging(ComposablePartCatalogChangeEventArgs! e);
    }
}