/store/book/author $.store.book[*].author the authors of all books in the store
//author $..author all authors
/store/* $.store.* all things in store, which are some books and a red bicycle.
/store//price $.store..price the price of everything in the store.
//book[3] $..book[2] the third book
//book[last()] $..book[(@.length-1)]
$..book[-1:] the last book in order.
//book[position()<3] $..book[0,1]
$..book[:2] the first two books
//book[isbn] $..book[?(@.isbn)] filter all books with isbn number
//book[price<10] $..book[?(@.price<10)] filter all books cheapier than 10
//* $..* all Elements in XML document. All members of JSON structure.
תחום פיתוח סביבות למידה, באגף מיפוי ותכנון, מינהל הפיתוח, חוקר ומקדם את עיצוב מרחב הלמידה, בפנים ומחוץ למבנה החינוכי, כטקסט פדגוגי ובהלימה לאסטרטגיות חינוכיות
Tungsteno is a project whose goal is to make mathematics accessible to everybody, completely free, based on open collaboration and the best pedagogical tools
G. Nelson, B. Xie, and A. Ko. Proceedings of the 2017 ACM Conference on International Computing Education Research, page 2--11. New York, NY, USA, ACM, (2017)