Writing apps for ORDBMS

Is there a white-paper or something out there on how to write apps which
take advantage of the object-relational features of ORDBMS's?

I'm using PostgreSQL right now, but I'm using it as a relational DB,
meaning that I'm not taking advantage of, to my knowledge, any of the
object capabilities of the DB.

I've looked at techdocs but not found anything to my liking.

    Thx,
    Aurangzeb

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