System.Xml.DocumentXPathNavigator.PreviousSiblingTail C# (CSharp) Méthode

        private XmlNode PreviousSiblingTail(XmlNode node, XmlNode sibling) {
            while (sibling == null) {
                node = node.ParentNode;
                if (node == null
                    || node.NodeType != XmlNodeType.EntityReference) {
                    return null;
                }
                sibling = node.PreviousSibling;
            }
            while (sibling != null
                   && sibling.NodeType == XmlNodeType.EntityReference) {
                sibling = sibling.LastChild;
            }
            return sibling;
        }