Hi Gary,
I have attached a (slightly) corrected version. Use sh:sparql instead of
sh:propertyValidator. And for the prefixes I have just pointed at the
dash namespace, which defines the correct things for the common
namespaces such as xsd - I couldn't see if your declarations were
correct as the example is a snippet only. Also I have used ?value as
return variable in the SELECT because then it will be picked up by the
validation report.
This may help
https://www.topquadrant.com/technology/shacl/tutorial-sparql-constraints/
and of course the spec
https://www.w3.org/TR/shacl/#sparql-constraints-example
HTH
Holger
On 29/07/2020 06:54, Gary Murphy wrote:
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 <mailto:g...@schemaapp.com>>
- Hunch Manifest, 15 Wyndham N 'C', Guelph
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# baseURI: http://example.org/sparqlConstraint
# imports: http://datashapes.org/dash
# imports: http://datashapes.org/schema
# prefix: ex
@prefix dash: <http://datashapes.org/dash#> .
@prefix ex: <http://example.org/sparqlConstraint#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix schema: <http://schema.org/> .
@prefix sh: <http://www.w3.org/ns/shacl#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
<http://example.org/sparqlConstraint>
a owl:Ontology ;
owl:imports <http://datashapes.org/dash> ;
owl:imports <http://datashapes.org/schema> ;
owl:versionInfo "Created with TopBraid Composer" ;
.
ex:BobPoint
a schema:GeoCoordinates ;
schema:latitude "-144.75N" ;
schema:longitude "172" ;
.
ex:GeoCoordinates-latitude-limits
a sh:PropertyShape ;
sh:path schema:latitude ;
sh:sparql [
sh:message "Absolute latitude cannot be > 90" ;
sh:prefixes <http://datashapes.org/dash> ;
sh:select """SELECT $this ?value
WHERE {
$this $PATH ?value .
BIND(abs(xsd:float(replace(str(?value),\"[a-zA-Z° ]\",\"\"))) AS ?lat)
FILTER( xsd:float(?lat) > xsd:float(90.0) )
}""" ;
] ;
.
schema:GeoCoordinates
sh:property ex:GeoCoordinates-latitude-limits ;
.
