Ha! The "and" is implicit ... I should seen that - the or/2 example there was a 
clue.  

Thanks for the assistance!!  I feel close to getting golog (and elevator 
example) working. 

Cheers,

Doug




--- On Wed, 6/29/11, Alexander Burger <a...@software-lab.de> wrote:

> From: Alexander Burger <a...@software-lab.de>
> Subject: Re: and/2 another pilog question
> To: picolisp@software-lab.de
> Date: Wednesday, June 29, 2011, 9:12 PM
> Hi Henrik,
> 
> > What is select ( http://software-lab.de/doc/refS.html#select/3 ) using
> > internally for the filter part?
> > 
> > Seems to me the filter part is a kind of implicit
> and.
> 
> Right.
> 
> As I wrote in the previous mails, all clauses in a Prolog
> rule (not only
> in 'select/3') are combined by an implict AND.
> 
> Cheers,
> - Alex
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