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I need to develop a webservice that reads data from 7 entities in Salesforce.com and transform this data in JSON format to be read in a IOS app using NSJson.
You can use PHP or JAVA to develop this.
All the data will use a unique user login. The app is for final customer and they are not a Salesforce user.
You do not need to develop the iphone app but you have to understand the NSJson IOS Sdk requirements.