https://learn.microsoft.com/it-it/dotnet/api/system.windows.markup.xamlsettypeconverterattribute?view=netframework-4.8.1
XamlSetTypeConverterAttribute Class (System.Windows.Markup) | Microsoft Learn
Indicates that a class can use a type converter to provide a value, and references a handler to use for type converter setting cases.
class systemwindowsmarkupmicrosoftlearn