xamarinmac 
namespace System.ServiceModel.Syndication
{
    [DataContract]
    public abstract class ServiceDocumentFormatter
    {
        protected static void WriteAttributeExtensions(XmlWriter writer, CategoriesDocument categories, string version);
    }
}
.NET 5.06.07.08.09.010.0
.NET Core 2.02.12.23.03.1
.NET Framework 3.54.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
.NET Standard 2.02.1
Information specific to xamarinmac
Assemblies

System.ServiceModel.Syndication , Version=9.0.0.3, PublicKeyToken=cc7b13ffcd2ddd51

System.ServiceModel.Syndication , Version=10.0.0.0, PublicKeyToken=cc7b13ffcd2ddd51

Referencing

Your project needs a package reference to System.ServiceModel.Syndication.

Package System.ServiceModel.Syndication (9.0.3) netstandard2.0
Platform Restrictions

This framework does not have platform annotations.

  • Built-in API
  • Package-provided API