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Data Synchronization Algorithms (SQLite in online database)

I am making an application that needs to have synchronized data with an online server. What is the best approach?

I was thinking of creating a local database (SQLite) that will synchronize with an online database with the same structure. Would an online XML or online database be better?

Another question: is there any algorithm known for data synchronization. There is?

Sorry my english.

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, . http://developer.android.com/resources/samples/NotePad/index.html http://developer.android.com/resources/samples/SampleSyncAdapter/index.html

Android SDK. Eclipse

File >
New >
Android Project >
Create project from existing sample >
Android 2.1 >
Select desired project

( Android 4.0, 7 8 - .)

. http://www.c99.org/2010/01/23/writing-an-android-sync-provider-part-1/

, XML SQLite, . http://andrewgertig.com/2010/07/android-and-ruby-on-rails/

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