Ajax has been around for quite some time now (it is a bit more than a year ago that Jesse James Garret coined the term) and it has quite some lovers, and just as many haters. First of all let’s distinguish between two different things that are often confused when we talk about Ajax.
What many think to be Ajax are relly two independant things:
Asynchronous Communication: allows fetching and sending data asynchronously, in the background.
DOM-Manipulation: which allows all those fancy flash-like effects on webpages, such as zooming images, floating windows, but also really basic stuff, like swapping text in boxes.
The potential of the Semantic Web is just unimaginably huge, to say it with The Hitchhikers Guide to the Galaxy’s words: it’s big. You just won’t believe how vastly hugely mindboggingly big it is. And there are already some examples:
MusicBrainz: Metadata for music
Last.fm: music profiling
flickr: imaging service
del.icio.us: bookmark sharing
FedEx
PayPal: Fast and easy payments online.
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