Forum OpenACS Q&A: Re: Message-view page in OpenACS - for site-wide search
In the Forums packge, I think OpenForce decided to use the (more powerful, more general?) tree_sortkey style (originally invented for OpenACS on PostgreSQL) for both Postgres and Oracle, rather than using connecty by on Oracle. At least, I think I vaguely recall someone (Don?) saying that on the BBoards here.