Hi Eithon.
Take a look at the "logical" conditional element in the Jess on-line manual:
"The logical conditional element lets you specify /logical dependencies/
among facts. All the facts asserted on the RHS of a rule become
dependent on the matches to the logicalpatterns on that rule's LHS. If
any of the matches later become invalid, the dependent facts are
retracted automatically."
http://herzberg.ca.sandia.gov/jess/docs/70/rules.html#logical_ce
This may be what you're looking for.
Win
Eithon Cadag wrote:
Hi all,
Is there any way to define logical fact dependencies outside of rules?
I have a system that recursively retrieves information from the Web
and instantiates that information as facts, and want to define logical
dependencies between the information derived from the assertion of
other information. Since the information is retrieved wholesale and
the facts are created all at once after they are retrieved, there
aren't rules that create these dependencies naturally. For example,
after retrieving information, the facts would be created thusly:
(assert (factA ... ))
(assert (factB ...))
(assert (edge (from factA) (to factB)))
and ideally we want the existence of factB predicated on the continued
existence of factA. Is this possible post-assertion, or is there a
better way of doing this?
Any tips or suggestions would be greatly appreciated.
Thanks,
- Eithon
--------------------------------------------------------------------
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]
--------------------------------------------------------------------
begin:vcard
fn:Win Carus
n:Carus;Win
org:Information Extraction Systems, Inc.
adr:;;20 East Quinobequin Road;Waban;MA;02468;USA
email;internet:[EMAIL PROTECTED]
title:President
tel;work:(617) 244-5068
tel;fax:(617) 244-5068
x-mozilla-html:FALSE
url:http://www.InfoExtract.com
version:2.1
end:vcard
