$ - Root element
$.store.book - All books in store
$.store.book[0] - First book
$.store.book[-1] - Last book
$.store.book[0,1] - First two books
$.store.book[:2] - First two books (slice)
$.store.book[*].author - All authors
$..author - All authors (recursive)
$.store.* - All things in store
$.store..price - All prices
$..book[?(@.price<10)] - Books cheaper than 10
$..book[?(@.author=~'/.*Tolkien/i')] - Books by Tolkien (regex)