[elephant-devel] Class Heirarchies and Queries

[Ian Eslick]

Works for me on the elephant-1.0 repository.  You have to indicate in  
the base class that subclasses will inherit its index.  Then you do  
get-instances-by-value/range on any class on the inherited slotname to  
get all instances inheriting from the base.

Ian

On Jul 14, 2009, at 4:01 PM, Red Daly wrote:

> On Tue, Sep 16, 2008 at 7:20 AM, Ian Eslick <eslick at media.mit.edu>  
> wrote:
> There is an :inherit slot keyword option for indexed slots.  It  
> causes subclasses of the defining class to share the index of the  
> base class.  You can inhibit subclass sharing by re-defining the  
> slot in the base class.  I found a bug in unstable and patched it so  
> this works again.
>
> As far as I can tell, this feature is now missing.  Am I mistaken?
>
>
>
> Calling map-inverted-index (and the top-level API fn's get-instances- 
> by-value/range) from the base or subclasses will return instances  
> for all classes that share that base index.  We could add some  
> refinements such as mapping from a subclass filters out any  
> superclass instances during the traversal.
>
> We can easily add a keyword arg to map-class and get-instances-by- 
> class to return all subclass instances as well.
>
> Ian
>
> Red
>
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