I don't think there's any profound technical reason why this wouldn't
be allowed, but this won't work right now. The deftemplates created by
do-backward-chaining and defclass for need-have will differ in some
internal details, and therefore won't compare equal; Jess won't let
you redefine a deftemplate except in the tricial case where the two
are identical. Note that "defclass need-have" is required because it
sets up some other data structures besides just creating the
deftemplate.
If you want to experiment with this, you can try commenting out the
line
(m_parent == t.m_parent) &&
near line 83 in jess/Deftemplate.java; the error should then go
away. I can't guarantee that Something Bad Won't Happen as a result of
this change.
I think Sander Faas wrote:
[Charset iso-8859-1 unsupported, filtering to ASCII...]
> Hello,
>
> Is it possible to assert a need- fact with the definstance function? For
> example I have made a deftemplate have, associated with the Java class Have
> and with the do-backward-chaining function I've made also a deftemplate
> need-have. Now I would like to do this:
>
> (bind ?needhave (new Have))
> (definstance need-have ?needhave dynamic)
>
> just as I would create a have fact like:
>
> (bind ?have (new Have))
> (definstance have ?have dynamic)
>
> Jess gives an error message when I try the first thing :-(
>
> Bye,
> Sander
>
>
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Ernest Friedman-Hill
Distributed Systems Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
Org. 8920, MS 9012 [EMAIL PROTECTED]
PO Box 969 http://herzberg.ca.sandia.gov
Livermore, CA 94550
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