Great, we are very happy for every new plugin!
GPE stores contact, calendar, and todo info in small platform independent sqlite databases. It should be relatively easy to transfer the files to the desktop, parse, and sync them. I believe that opie keeps similar files except that they are xml instead of sqlite.
I would advise you to try to use the sqlite database API as much as possible. Fetching the whole file, modifying it and sending it back should only be used as a last resort (as in the Opie case). From a sync perspective, it is _much_ better to be able to fetch and modify individual entries.
Good luck!
/Bo
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