... which allows to search for books by using their ISBN.

This search engine is the first implementation making use of
an extended version of the Python script already used to for
XML-based search engines (see commit c48fe708).
This script has been extended and refactored to parse JSON data
(as returned by Google Books) similar to how XML data is parsed.
Bibliographic entries' fields are extracted from the JSON data
using immediately invoked function expressions (IIFE) snipplets
stored in file onlinesearchgooglebooks-parser.in.cpp

BUG: 484418