https://learn.microsoft.com/en-gb/dotnet/api/system.data.metadata.edm.readonlymetadatacollection-1.enumerator?view=netframework-4.8.1&viewFallbackFrom=net-10.0
ReadOnlyMetadataCollectionT.Enumerator Struct (System.Data.Metadata.Edm) | Microsoft Learn
system dataenumeratorstructmetadataedm