[Versa] DOT

[Michael Olson]

>
> I think I like this better.  we define (smaller names to cut down on  
> typing)
>
> $versa:statement
> $versa:subject
> $versa:predicate
> $versa:object
>
> The last three are shortcuts onto the first.
>
> Then "." is defined as the appropriate value from the last three  
> variables
>

I should clearify, the following three are equivilent

all() - ns:age . ==18
all() - ns:age $versa:object == 18
all() - ns:age object($versa:statement) == 18

Mike

> Mike
>
>
>>> or
>>>
>>> all() - (./../.. |- rdf:type -> owl:ObjectProperty) -> *
>>>
>>> In this, the dot path would represent "the predicate of the statement
>>> being evaluated in the outer traversal".  Or, the first "." would be
>>> the subject of the inner filter, then the first ".." would be the
>>> statement of the inner filter, and finally the next ".." would be the
>>> predicate of the outer traversal
>>
>> Hmm.  Even with your explanation this takes me a lot of squinting to
>> grok.
>>
>> I'd personally end to break such a query down by composition, even if  
>> I
>> had this dot trick available.
>>
>>> The first use case I see as much more useful.  Especially when you
>>> start doing logic based on other pieces of the statement at different
>>> locations of a traversal.  Ex,
>>>
>>> all() |- *:age -> (predicate(./..) == ns1:age & . == "fifteen") |
>>> (predicate(./..) == ns2:age & . == 15)
>>
>> Ditto above statement.  Seems a pretty heavy syntactic/conceptual load
>> to give such an atypical use-case (again I think I'd prefer to use  
>> query
>> composition in such cases even if the above syntax were legal).
>>
>>
>> -- Uche Ogbuji                               Fourthought, Inc.
>> http://uche.ogbuji.net                    http://fourthought.com
>> http://copia.ogbuji.net                   http://4Suite.org
>> Articles: http://uche.ogbuji.net/tech/publications/
>>
>> _______________________________________________
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>>
> ----------------------------------------------------------------------- 
> ------------------
> Mike Olson                                                Principal  
> Consultant
> mike.olson at fourthought.com                +1 720 253 4662
> Fourthought, Inc.                                       
> http://Fourthought.com
> PO Box 270590,                                       http://4Suite.org
> Louisville, CO 80027-5009, USA
> XML strategy, XML tools, knowledge management
>
> _______________________________________________
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> Versa at lists.fourthought.com
> http://lists.fourthought.com/mailman/listinfo/versa
>
------------------------------------------------------------------------ 
-----------------
Mike Olson                                                Principal  
Consultant
mike.olson at fourthought.com                +1 720 253 4662
Fourthought, Inc.                                       
http://Fourthought.com
PO Box 270590,                                       http://4Suite.org
Louisville, CO 80027-5009, USA
XML strategy, XML tools, knowledge management