[ACT-R-users] DM Retrieval Request and chunk-type hierarchy/subtype/supertype

[Stu @ AGS TechNet]

Dan,
    Yes thanks.  That was exactly what I was looking for.
    I would suggest that your second paragraph (probably with little to 
no change) be added to the Declarative Module section of the 
reference-manual.doc.  Maybe on page 201 right before the section on 
Activation.  What do you think?

Stu

db30 at andrew.cmu.edu wrote:
> --On Thursday, August 27, 2009 2:24 PM -0400 "Stu @ AGS TechNet" 
> <stu at agstechnet.com> wrote:
>
>   
>> All,
>>     I have been looking for a detailed discussion of how a retrieval
>> request "+retrieval>" functions for chunk-type supertype matches (or
>> subytpe matches).
>>     I have not been able to find any such discussion (in archives,
>> tutorials, or reference manual).
>>     Can anyone steer me in the right direction?
>>     My questions are:
>> Thank you,
>> Stu
>>
>>     
>
>
> It looks like your specific questions got clipped, but there's not
> really anything special about it so hopefully this general info
> will help.
>
> To be retrieved, a chunk must be a subtype of the chunk-type specified
> in the retrieval request (a chunk-type is considered to be a subtype of
> itself).  That's basically all there is to it.  There is no penalty or
> bonus to the activation of the possible matches based on the specific
> chunk-type of a chunk in the retrieval set.
>
> For more details of the matching you can look at the match-chunk-spec-p
> and find-matching-chunks commands in the reference manual.  Essentially,
> the declarative module uses find-matching-chunks with the default testing
> functions and the set of all chunks in DM to determine which chunks are a
> match.
>
> Hope that helps,
> Dan
>
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>   
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