given the similarity between XQuery and JSONiq, I thought that for the people who need to deal with both formats -- JSON and XML--

(and I am sure there are plenty), this book will maybe bring some insights of the amazing power of combining the two languages for the 

more general goal of information processing.

You can buy it here:

http://www.amazon.com/JSONiq-The-NoSQL-Ghislain-Fourny/dp/1489530371/ref=sr_1_1?ie=UTF8&qid=1370960024&sr=8-1&keywords=jsoniq

JSONiq specifications can be found here: http://www.jsoniq.org/

Good reading, best regards

Dana