Hi Petr To get more info, you need to download for free "Sentences personal edition". You will find then that several .PDF documentations are available.
Patrick ----- Original Message ----- From: "Petr Krenzelok" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, January 29, 2002 9:31 AM Subject: [REBOL] Re: Implementing the associative model of data (tm) in Rebol > I just read the white-paper and I don't understand one thing - it talks about > advantages upon relational model, while it doesn't show single example of how > data are stored, and what tool to use for querying. It is very easy to say SQL > is something to be replaced, but then they should say in what form are > queries/views applied. Or I just don't understand it deeply enough yet. Do you > have any practical example of associative model usability? What exactly do > schemas and metadata describe? > > Thanks, > -pekr- > > Andrew Martin wrote: > > > So I had a look at the white paper and implemented the flight example in > > Rebol. Here's the contents of %Flight.r: > > > > "Flight BA1234" > > "London Heathrow" > > 12/Aug/98 > > 10:25 > > "arrived at" > > "on" > > "at" > > [1 5 2] > > [8 6 3] > > [9 7 4] > > "Concorde" > > [10 6 11] > > > > Basically a block of Rebol values; string!, date!, time! and block!. The > > associations are the three integers in blocks at the end. Then I wrote this > > to join up the associations: > > > > Database: load %Flight.r > > > > SVO: function [Database [block!] Item] [Subject Verb Object] [ > > either block? Item [ > > Subject: Item/1 > > Verb: Item/2 > > Object: Item/3 > > Subject: SVO Database Database/:Subject > > Verb: SVO Database Database/:Verb > > Object: SVO Database Database/:Object > > reduce [Subject Verb Object] > > ] [ > > Item > > ] > > ] > > > > foreach Item Database [ > > print SVO Database Item > > ] > > > > And running the above script gives the output: > > > > Flight BA1234 > > London Heathrow > > 12-Aug-1998 > > 10:25 > > arrived at > > on > > at > > Flight BA1234 arrived at London Heathrow > > Flight BA1234 arrived at London Heathrow on 12-Aug-1998 > > Flight BA1234 arrived at London Heathrow on 12-Aug-1998 at 10:25 > > Concorde > > Flight BA1234 arrived at London Heathrow on 12-Aug-1998 at 10:25 on Concorde > > >> > > > > Note that I've added the "on Concorde" part to the example. > > > > I'll think I'll work up some more magic stuff and thread my HTML dialect > > through it, so I can create sentences (SVOs) through a browser > > interactively. > > > > Andrew Martin > > ICQ: 26227169 http://valley.150m.com/ > > -><- > > > > -- > > To unsubscribe from this list, please send an email to > > [EMAIL PROTECTED] with "unsubscribe" in the > > subject, without the quotes. > > -- > To unsubscribe from this list, please send an email to > [EMAIL PROTECTED] with "unsubscribe" in the > subject, without the quotes. > ______________________________________________________________________________ ifrance.com, l'email gratuit le plus complet de l'Internet ! vos emails depuis un navigateur, en POP3, sur Minitel, sur le WAP... http://www.ifrance.com/_reloc/email.emailif -- To unsubscribe from this list, please send an email to [EMAIL PROTECTED] with "unsubscribe" in the subject, without the quotes.
