<PackageReference Include="NETStandard.Library" Version="2.0.0-preview2-25401-01" />

System.Xml.Serialization.XmlSchemaProviderAttribute

public sealed class XmlSchemaProviderAttribute : Attribute
namespace System.Xml.Serialization { public sealed class XmlSchemaProviderAttribute : Attribute { public bool IsAny { get; set; } public string MethodName { get; } public XmlSchemaProviderAttribute(string methodName); } }