PART III
Chapter 10: Web Services and Beyond 511
The situation will be no different for other public Web Services found. If you are looking
for direct consumption in a client, it will almost certainly be JSON or script responses
invoked by <script> tag insertions and not using any sort of XHR mechanism given their
same origin restrictions. Besides Google, you will find all sorts of services from sites like
Yahoo, eBay, Amazon, and many others. A very complete list of Web APIs can be found at
http://www.programmableweb.com/apis.Mash-ups
With all these various Web Services providing interesting data online, it would seem we
could build valuable aggregates by combining and correlating data fetched from various
services into a new page. This concept is what is popularly termed a mash-up. Now, as we