[SyncEvolution] sqlite backend enhancement

Hello, I am trying to understand how sqlite backend is implemented. Acually, all fields that are inserted via SQLiteContactSource::insertItemAsKey doesn't include those who have complex values like "TEL" field. Does getSynthesisAPI()->getValue permit to get values like TEL or RRULE ones? How can i specify a complexe values like TEL or RRULE when doing readitem operation via getSynthesisAPI()->setValue api ? How can i differenciate between AALARM, DALARM when doing readitem operation cause there is no global fieldname for these properties in xml config files ? THX.