Idea: Integrate with astpath and xpyth in order to allow XPath queries for user-defined regions

[mpourmpoulis]

https://github.com/hchasestevens/astpath

https://github.com/hchasestevens/xpyth

An important question, is whether the user should script On the grammar side or on the plug-in side. The first is easier but will require Installing xpyth, whereas the second option allows me to package them with the plug-in