https://learn.microsoft.com/ko-kr/dotnet/api/system.windows.data.xmlnamespacemappingcollection?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-6.0
XmlNamespaceMappingCollection Class (System.Windows.Data) | Microsoft Learn
Represents a collection of XmlNamespaceMapping objects.
class systemwindowsdatamicrosoftlearn