[SyncEvolution] D-Bus API: about getReports (was: syncevo-dbus-server implementation)

Hi, Currently the type of argument 'sync reports' is 'aa{ss}'. And in C++, we use 'std::vector<std::map<std::string, std::string> >' to represent this dbus type. I wonder whether there are some reasons to use 'string' as type of key and value in map. To get report, three enum values are provided to retrieve: ItemLocation, ItemState and ItemResult. And the retrieved result is also an integer. So I think it is natural to use map with integer key and value. The key is a 32 bit integer, here is how it is represented: Bits 31 - 24 Bits 23 - 16 Bits 15 - 8 Bits 7 - 0 Reserved ItemLocation ItemState ItemResult Any comments are welcome. Cheers, Yongsheng