XPath 2.0 Libraries for .Net

Question

Which XPath 2.0 libraries (apart from saxon) are available, preferably for .Net?

Answer 1

See the recently announced (Sep. 2010) XQSharp XSLT 2.0 processor.

It is developed in and for .NET.

Answer 2

Update: see Dimitre's answer for XQSharp Beta, now renamed XMLPrime, which contains an XSLT/XPath 2.0 processor.

Unfortunately, the answer is disappointing: none whatsoever. Microsoft did have plans and even asked the community for input, but never materialized them. There was a moment where they seemed to investigate whether it was feasible, but no plans have been announced up until .NET 4.5. See also this duplicate question, which answers this in more detail. M. David Peterson has a blog post that tracks a bit of the efforts of Microsoft till end 2007.

Also, there's this thread by me on the xsl-list, which shows some efforts of other companies so far, but nothing on the .NET front. See the answer by Michael Kay.