I am hoping to master the fine art of sh:sparql and sh:ask validators, and
I have a situation where the source data can have geocoordinates as
strings, eg "99.91°N" - the following sparql code correctly detects values
out of range:
SELECT *
WHERE {
BIND("99.91°N" as ?value)
BIND(abs(xsd:float(replace(str(?value),"[a-zA-Z°]",""))) as ?lat)
FILTER( ?lat > "90.0"^^xsd:float )
}
So with a source graph schema:Geocoordinate
ex:BobPoint
a schema:GeoCoordinates ;
schema:latitude "-144.75N" ;
schema:longitude "172" ;
.
I am expecting to detect that bad latitude with the following bit of
shacl using sh:sparql to clean the ?value and cast it to float for
comparison, just as with the above sparql code. But it doesn't work ...
hmshape:GeoCoordinates-latitude-limits
a sh:PropertyShape ;
sh:path schema:latitude ;
sh:propertyValidator [
a sh:SPARQLSelectValidator ;
sh:prefixes schema: ;
sh:prefixes xsd: ;
sh:select """
SELECT $this ?lat
WHERE {
$this $PATH ?value .
BIND(abs(xsd:float(replace(str(?value),\"[a-zA-Z° ]\",\"\"))) AS ?lat)
FILTER( xsd:float(?lat) > xsd:float(90.0) )
}""" ;
] ;
.
hmshape:GeoCoordinatesShape
a sh:NodeShape ;
sh:property hmshape:GeoCoordinates-latitude-limits ;
sh:targetClass schema:GeoCoordinates ;
.
Unfortunately, this rule always approves whatever value I give it, no
warnings or errors. I've tried variations, casting to xsd:float or not,
using sh:validator with sh:ask, but it still accepts any value. Just to be
sure, I added sh:minCount 2 to assure myself the rule was being reached,
and it is.
What am I missing?
Also, is this the correct use of sh:prefixes? these are defined in the
hmshape owl:Ontology with sh:declare bnodes
--
Gary Lawrence Murphy <g...@schemaapp.com> - Hunch Manifest, 15 Wyndham N
'C', Guelph
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