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 the OraDynaset object.

OraParameter belongs to the OraParameters object.

OraMDAttribute belongs to the OraMetaData object.

OraAQMsg belongs to the OraAQ object.