Data interfaces

UDomain	Root interface of a database.
UStorage	Main interface used to create, open, read and write objects.
UObject	Main interface used to read and write data of objects.
UList	Interface of a list attribute of a UObject.
UBitFlagSet	BitFlagSets are used to identify attributes.
UBitFlagSetSingle	UBitFlagSetSingle is a part of a UBitFlagSet.

Additional information

General information:

size: always means "bytes"
length: always means "elements"

example: the size of UINT64 [2] is 2*8 = 16, the length of UINT64 [2] is 2

All interfaces you get have an initial reference count of 1. To increment the count call 'AddRef' and to decrement it call 'Release'. When the count reaches 0, the interface will be destroyed.
Every interface you don't need anymore should be released.