XPath navigator based on System.Xml.XPath.XPathNavigator which allows easily implement XPath support for any tree based structure.
Everything you need is to implement simple interface to enumerate children and attributes.
There are also two ready to use implementations:
AnyTreeXPath.Json.JObjectXPathElement - XPath for Json;
AnyTreeXPath.WinForms.ControlXPathElement - XPath for Windows Forms visual tree;