Data stored locally on the ipad

Received a mandate to develop a simple file entry program on ipad, data entry and save on ipad, also provides a simple query to query data directly from the ipad, what are the specific implementation process, the data will be in the ipad saved as xml files, or other files can be saved to, or above, you can run a lightweight database, expert advice. . .
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Decisively without considering other uses sqlite
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CoreData
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Sqlite bar with a small database, the Internet has a ios sqlite framework FMDatabase, there are easy and convenient. Xml or other files saved as a small amount of data that was okay, go down after a large amount of data on the trouble
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The easiest to use nsuserdefault,
Then plist
Then to the sqlite
In then coredata

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Plist with it, comes easily. If we consider the case on sqlite database