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Re:Web service
If you want to Provide Services to you partners or Customers, without having them to understand the webpages and the way you are returning the data since web services returns true xml document in relational format. It\'s very easy to parse and use your service effectly.
for examples, airline reservation. if some one is reseller to your service, you just buld the webservice and provide them. they can just make a call and incorporate that in their website. user may not know that he is the reseller or agent of it which makes very user friendly site insted of using wrapers or screen scraping technology.
there are may other reasons too.
hope this answers your question.
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