https://dhis2.github.io/dhis2-android-sdk/api/-d-h-i-s2%20-android%20-s-d-k/org.hisp.dhis.android.core.arch.repositories.scope/-repository-scope/-order-by-direction/index.html
OrderByDirection
https://mongodb.github.io/mongo-csharp-driver/2.0/apidocs/html/T_MongoDB_Driver_Linq_OrderByDirection.htm
OrderByDirection Enumeration
Represents the direction of an order by clause.
enumeration