Updates scheme rule-helpers for r2l questions; a few bugs remain. . .

@AmeBel @ruiting @linas @bgoertzel 
got it

--------------------------------------------
On Wed, 9/24/14, Amen Belayneh <notifications@github.com> wrote:

 Subject: Re: [opencog] Updates scheme rule-helpers for r2l questions; a few bugs remain. . . (#1037)
 To: "opencog/opencog" <opencog@noreply.github.com>
 Cc: "anitzkin" <a_nitzkin@yahoo.com>
 Date: Wednesday, September 24, 2014, 4:20 PM
 
 In
 opencog/nlp/relex2logic/rule-helpers.scm:
 > +))
 > +;
 >
 +;--------------------------------------------------------------------------------------------------------
 > +; WHEN QUESTIONS
 >
 +;--------------------------------------------------------------------------------------------------------
 > +; 
 > +; Example: "When did jazz die?"
 > +;
 > +(define (when-SVQ-rule subj_concept subj_instance verb
 verb_instance)
 > +	(list (ImplicationLink (PredicateNode verb_instance
 df-node-stv) (PredicateNode verb df-node-stv) df-link-stv)
 > +	(InheritanceLink (ConceptNode subj_instance
 df-node-stv) (ConceptNode subj_concept df-node-stv)
 df-link-stv)
 > +	(AtTimeLink df-link-stv
 > +		(VariableNode "$qVar")
 > +		(EvaluationLink df-link-stv
 > +			(PredicateNode verb_instance df-node-stv)
 > +				(ConceptNode subj_instance df-node-stv)))
 
 need a ListLink after the predicate.
 
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