Read and Write data in iphone app

I want to build a simple offline mobile app which reads and writes or stores info to a file, xml, json, txt or whatever.
What is the best way to do this?
I am currently learing jQuery and PHP, so I don't want to have to learn some other million things that does one thing but not another.
Can this be achived without objective C? Can i do this with Jquery and phone Gap?
Thanks

Do a search for 'HTML 5 Storage' and you'll find a bunch of resources that will help. Here's a few
http://www.w3schools.com/HTML/html5_webstorage.asp
http://diveintohtml5.info/storage.html
http://htmlpad.wordpress.com/2010/03/10/html-5-data-storage-javascript-api-on-ipad-and-iph one/

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