Download online database for use in app

[seacucumber]

Hi,

I am currently making an app that needs to download data to display what is for lunch (long story ). Anyway data will be updated every week and then downloaded when there is internet connection. The thing I'm stuck on though is how to store the dat online and the best way to retrieve it into the app. I have had a look at NSXML and CoreData but I don't really know how to create the database for them. Eventually I do want to include their data as part of a UILocalNotification so it would would be great if they were stored offline.

Sorry for such a tall order....

Jonathan