Replying myself after reading the manual :)
I now first defined a subclass of sp:Functions called sumFunction.
Then I defined a spin:constraint for it: Argument sp:arg1 : House
Finally I defined a body for it (delete at House...):
SELECT SUM(?cost) AS ?totalCost
WHERE {
arg1 :hasPart_transitive ?Part .
?Part :cost ?cost .
OPTIONAL {
?Part :hasPart_directly ?anotherPart .
} .
FILTER (!bound(?anotherPart)) .
}
still 2 problems:
1. the box for the body stays red
2. at House: the box for the spin:rule:
CONSTRUCT {?this :totalCost ?totalCost } WHERE { LET (?totalCost :=
sumFunction (?this)).
}
is still red (despite the function is now known...).
Feel I am getting closer....thx for getting it to work!
Michel
On 17 mrt, 13:28, Michel Bohms <[email protected]> wrote:
> Hi Holger,
>
> In earlier mails we discussed the determination of totalCost (of some
> 'whole') via a helper function.
>
> When I do as spin:rule:
>
> CONSTRUCT {?this :totalCost ?totalCost } WHERE { LET (?totalCost :=
> sumFunction (?this)).
>
> }
>
> it seems the box stays red although I defined:
>
> a spin:body
>
> SELECT SUM(?cost) AS ?totalCost
> WHERE {
> ?this :hasPart_transitive ?Part .
> ?Part :cost ?cost .
> OPTIONAL {
> ?part :hasPart_directly ?anotherPart .
> } .
> FILTER (!bound(?anotherPart)) .
>
> }
>
> clearly I am missing the "sumFuction" definition itself but how do I
> do that ? (assuming SUM is now implemented in the latest beta).
>
> (to refresh your memory: the idea was to calculate the cost of the
> whole by counting all the leaf part's cost via querying over the all
> transitive parts and then filter out the atomic leafs)
>
> thx a lot, Michel
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