System.Private.Xml

This is the primary XML (eXtensible Markup Language) assembly. It provides standards-based support for processing XML.

It provides core implementations of various types including XMLReader, XMLWriter, XMLDocument, XMLSerializer, and more. These types are exposed via the various System.Xml[.*] assemblies.

Documentation can be found at https://learn.microsoft.com/dotnet/standard/serialization/introducing-xml-serialization.

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Source

• XmlReader and XmlWriter: ../System.Xml.ReaderWriter
• XmlDocument: ../System.Xml.XmlDocument
• XmlSerializer: ../System.Xml.XmlSerializer

Higher level APIs for performing LINQ operations on XML entities:

• LINQ to XML: ../System.Private.Xml.Linq
• XDocument: ../System.Xml.XDocument
• XPath: ../System.Xml.XPath, ../System.Xml.XPath.XDocument

APIs to support the creation and validation of XML digital signatures:

• System.Security.Cryptography.Xml: ../System.Security.Cryptography.Xml; for example EncryptedXml and SignedXml.

Deployment

The XML processing libraries are included in the shared framework and also shipped as NuGet packages.

• System.Xml.ReaderWriter
• System.Xml.XmlDocument
• System.Xml.XmlSerializer
• System.Xml.XDocument
• System.Xml.XPath

The System.Security.Cryptography.Xml library is shipped as a NuGet package as part of .NET Platform Extensions.

• System.Security.Cryptography.Xml

These NuGet packages are considered "legacy" and should not be referenced by projects compatible with .NET Standard 2.0.