HtmlAgilityPack in F# Interactive

While using HtmlAgilityPack (version 1.4.0 Stable) in F# Interactive (of Visual Studio 2010), I was unable to access attributes of nodes. In order to debug, I converted my script into a compiled code and soon was notified that HtmlAgilityPack requires a reference to the System.Xml, Version=2.0.0.0 assembly. After switching the target framework of my project to .NET 3.5, I was able to reference the required assembly and all worked like a charm.