This is a hierarchy diagram.

The top of the diagram is the OraSession.

Next is OraServer, followed by OraDatabase

The diagram indicates that the following are created from OraDatabase:

OraSQLStmt

OraDynaset

OraParameters

OraParameterArray

OraMetaData

OraAQ

The diagram also indicates the following:

OraField belongs to OraDynaset object

OraParameter belongs to OraParameters object

OraMDAttribute belongs to OraMetaData object

OraAQMsg belongs to OraAQ object