XPath Queries Returning Unexpected Results with XmlDocument in C#
I've encountered a strange issue with Hey everyone, I'm running into an issue that's driving me crazy. I'm currently working on an XML processing task using `XmlDocument` in C#. The scenario I'm working with is that my XPath queries are returning unexpected results, particularly when dealing with nested elements. For instance, I have the following XML structure: ```xml <catalog> <book> <title lang="en">The Catcher in the Rye</title> <author>J.D. Salinger</author> </book> <book> <title lang="es">Cien años de soledad</title> <author>Gabriel García Márquez</author> </book> </catalog> ``` My goal is to retrieve all book titles with the language attribute set to 'en'. I attempted the following XPath query: ```csharp XmlDocument doc = new XmlDocument(); doc.Load("books.xml"); XmlNodeList nodes = doc.SelectNodes("/catalog/book/title[@lang='en']"); ``` However, the `nodes` collection is returning empty, even though there is a matching title in the document. I also tried using `doc.DocumentElement.SelectNodes(...)` but faced the same scenario. To troubleshoot, I printed out the entire XML content and confirmed that it loads correctly. I double-checked the XPath syntax, but I still need to figure out why I'm not getting the expected results. I'm using .NET 5 and `XmlDocument`, and I've verified that the XML file is well-formed. Could there be an scenario related to namespaces or perhaps something else that I might be overlooking? Any guidance would be greatly appreciated! I'm working on a web app that needs to handle this. Thanks in advance! I'm on Ubuntu 22.04 using the latest version of C#.