I'm updating codes to use MSXML6.0 from MSXML3.0. However, I noticed that, for MSXML3.0, the default "SelectionLanguage" is "XSL Pattern", while MSXML6.0 only support XPath. I have concerns that this change would introduce differences in the query syntax.
Can somebody list the difference of syntax between these two syntax?
XPath, in my experience, is much easier to get your head around. I avoid XSL like the plague if I can. But you are right, the syntax is very different, so if you want to switch from XSL to XPath you have some work ahead of you. I cannot explain the differences easily, but this tutorial should give you some idea of what XPath is about:
XSL Pattern, if I remember correctly, was a selection language like XPath but was implemented by Microsoft before XPath was standardised (possibly even created). I don't think anyone even has anything that documents XSL Pattern any more. You can basically forget about it and concentrate on XPath. It has the same purpose but is supported and standardised.