[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Why Multipath (LCA) Hierarchical Query Processing Works Au
On Mon, Aug 3, 2009 at 11:18 AM, Robert Koberg<rob@koberg.com> wrote: > Peter, > > Don't suppose you can post your schema and some examples of how you use it? > It sounds very interesting. > Afraid not, the institution licenses it for external use and I can't step on that process. However, the basics are simple enough you basically want something like the following: tree tree_node data_item ---------------- ------------------ ----------------- tree_id (pk) --> tree_id (pk) <--- data_id (pk) . left (pk) type_id (fk) . right (pk) . . . data_id (fk) . . . If that comes through in any decipherable way. Here "tree_node" is organized into a hierarchy using Celkos set / subset pattern, or perhaps Tropashko's nested intervals implementation, depending on your requirements (Ie; if you need to index sets of nodes containing given points). Depending on your requirements for strong typing, there is a trick here with how you use the table (or tables) on the data side, but that starts to get into the stuff that I probably shouldn't discuss in public (and is only peripherally relevant to the issue at hand) We can talk more off list, if you want to pursue in detail... -- Peter Hunsberger
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