I guess their focus was on speed. XML is pretty slow and verbose, and whilst JSON is better, it's not the best solution. MongoDB's BSON is quite cool though. W

I guess their focus was on speed. XML is pretty slow and verbose, and whilst JSON is better, it's not the best solution. MongoDB's BSON is quite cool though. Web Services and the associated HTTP headers are relatively slow, but browsers can make them, so are kind of necessary.