At least I found what the 'ActionLink 
is about:

At the center of the architecture is the ActionLink. Its a new,
experimental link type used for holding simplified representations
of imperatives, intermediate in form from the fully-parsed English
language input, and the low-level physical motor commands.  That
is, parsed English is converted into these simplified action structures,
and then these simplified structures are mapped to actual physical

On Wednesday, November 30, 2016 at 8:38:21 AM UTC-5, Apil Tamang wrote:
> Hi,
> Trying to understand the code-framework for chatbot-eva in more detail. I 
> think that most of these questions arise from deficit understanding of the 
> basics of opencog  and/or familiarity with its multitude of atom-types. 
> I've used to search details about a new 'Node' when I 
> come across one, but sometimes, some node types don't show up.
> Anyways, I've included the questions in the attached image itself. Let's 
> assume for the sake of learning that 'look-rule-1' (lines 59 - 90) is just 
> what it is. The main questions are around:
> - how do the binding of values occur for the various variables declared 
> (i.e. $sent, $parse, $verb-inst, etc.)
> - What is happening inside the 'AndLink' block ? Are each of those 
> statements essentially just boolean statements (in account of being 
> evaluated against an AndLink) ? 
> - How does the 'ActionLink' node work. The wiki is completely mum about 
> this..
> Any amount of detail would help.. and I think would provide a good 
> foundation to understand more code appearing in this code-base.

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