https://learn.microsoft.com/pt-pt/dotnet/api/system.xml.xmllinkednode.previoussibling?view=netframework-4.8.1&viewFallbackFrom=net-10.0
XmlLinkedNode.PreviousSibling Property (System.Xml) | Microsoft Learn
Gets the node immediately preceding this node.
property systemprevioussiblingxmlmicrosoftlearn