The top of the diagram is the OSession.

Next is OServer, followed by ODatabase

The diagram indicates that the following are created from ODatabase:

OSQLStmt

ODynaset

OParameters

OParameterArray

OMetaData

OAQ

The diagram also indicates the following:

OField belongs to ODynaset object.

OParameter belongs to OParameters object.

OMDAttribute belongs to OMetaData object.

OAQMsg belongs to OAQ object.