Whether to apply the declarative or imperative programming paradigms really depends much on how data and behaviour should be bound together in your problem domain. When the relationship between data and behaviour is fairly weak and highly dynamic, DSLs with declarative syntax built upon rule engines or workflow/process engines are more expressive to transfer the real-world scenarios to a computational model. Workflow/process engines emphasize on conducting the behaviour while rule engines emphasize on constraining the data. Declarative and imperative programming paradigms are not mutually exclusive and a good programming language (for example Jess), usually takes advantages of both paradigms to achieve maximal expressiveness.
On 1/31/07, Doug Metzler <[EMAIL PROTECTED]> wrote:
And the degree to which a production system leans toward the declarative or imperative end of the spectrum is as much a matter of programming style as the language itself. To the degree that you are thinking of each rule as a specification of what to do under a set of circumstances, with flow of control influenced strictly by how the KB changes, you are emphasizing declarative programming. To the extent that you are thinking explicitly about a specific flow of control as in convential programming you are moving toward procedural programming. Doug Metzler On Tue, 30 Jan 2007, Ernest Friedman-Hill wrote: > Well, rules themselves are definitely a declarative programming concept. But > Jess also offers an imperative language, and in fact the right-hand-sides of > rules consist of imperative code. > > So in fact, Jess, and systems like it, are hybrid declarative/imperative. > > On Jan 30, 2007, at 5:03 PM, Matthew J Hutchinson wrote: > >> Hi everyone, >> >> I'm trying to categorize Jess in terms of the different programming >> language paradigms. Is Jess "declaritive"? >> >> Thanks, >> Matt >> > > --------------------------------------------------------- > Ernest Friedman-Hill > Advanced Software Research Phone: (925) 294-2154 > Sandia National Labs FAX: (925) 294-2234 > PO Box 969, MS 9012 [EMAIL PROTECTED] > Livermore, CA 94550 http://www.jessrules.com > > -------------------------------------------------------------------- > To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' > in the BODY of a message to [EMAIL PROTECTED], NOT to the list > (use your own address!) List problems? Notify [EMAIL PROTECTED] > -------------------------------------------------------------------- > -------------------------------------------------------------------- To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED] --------------------------------------------------------------------
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