Hi,
I have requirement where I need to create a string that is based on
the recursive parent relationship in a hierarchy. After looking
around, I was hopeful that I would be able to create a recursive SPIN
function to achieve this but although the function appears to be
called recursively, I am not able to bind to the results of the
recursive calls to produce a concatenated string. I think part of the
problem might be that the last function call returns a empty result
set but I'm not 100% sure.
The SPIN function I am using is as follows:
SELECT ?name
WHERE {
?arg1 prod:hasParent ?parent .
?arg1 prod:name ?name .
BIND (prod-instance:getLabel(?parent) AS ?temp) .
}
which returns "Pumps" (see what is essentially the call stack in the
SPIN statistics below).
Note that I know that this won't return a concatenated string but I
would just be happy to see the function return a binding for ?temp so
I can move forward. Not that in the statistics below, prod-instance:OE
does not have a statement for hasParent. (i.e. it is the root of the
hierarchy)
The results I am seeing using SPIN statistics are:
prod-instance:getLabel SPIN Function prod-instance:getLabel(prod-
instance:OE) : Empty result set for SPIN function ...
prod-instance:getLabel SPIN Function prod-instance:getLabel(prod-
instance:CSG) = "CSG"^^xsd:string
prod-instance:getLabel SPIN Function prod-instance:getLabel(prod-
instance:TALINGA) = "Talinga"^^xsd:string
prod-instance:getLabel SPIN Function prod-instance:getLabel(prod-
instance:4120-TGWT1) = "Water Treatment"^^xsd:string1
prod-instance:getLabel SPIN Function prod-instance:getLabel(prod-
instance:4120-Utilities) = "Utilities"^^xsd:string
prod-instance:getLabel SPIN Function prod-instance:getLabel(prod-
instance:4120-Hot-Warm-Water) = "Hot & Warm Water"^^xsd:string
prod-instance:getLabel SPIN Function prod-instance:getLabel(prod-
instance:4120-HW-PUMPS) = "Pumps"^^xsd:string
Anyone that has some experience solving this sort of problem or any
thoughts would be greatly appreciated.
Thanks,
Mark.
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