On 11/25/2020 8:48 AM, Steve Ray wrote:
I agree with you. Is there no way to have "variable" predicates in
native SHACL? Or is my only option here to use the embedded SPARQL?
Exactly. SHACL node expressions do not have a notion of variables. It is
intentionally limited to be easier, but then doesn't offer all features
that SPARQL does. There is nothing wrong with using SPARQL node
expressions as a fallback.
Holger
Steve
On Tue, Nov 24, 2020 at 12:51 PM Irene Polikoff <[email protected]
<mailto:[email protected]>> wrote:
There is no path in your example that could get from ?this to
?prop. A path specifies predicates. You do not have predicates to
specify - you are finding out your predicates in the first WHERE
statement. This is why you need to have 2 statements in the WHERE
clause and can’t boil them down to a path expression in a single
statement.
On Nov 24, 2020, at 12:39 PM, Steve Ray <[email protected]
<mailto:[email protected]>> wrote:
I'm trying to get comfortable with using SHACL code and wean
myself from embedded SPARQL. However, I'm having some trouble
mapping certain common SPARQL patterns into the
SHACL counterpart. Specifically, here's an example. I'm trying to
find all the values of any property that is a subPropertyOf a
parent property (c223:hasProperty).
The SPARQL should (I think) be something like this:
c223:PropertiesShape
rdf:type sh:PropertyShape ;
sh:path c223:hasProperty ;
sh:name "PropertiesShape" ;
sh:values [
sh:sparql [
sh:prefixes <http://www.w3.org/2000/01/rdf-schema
<http://www.w3.org/2000/01/rdf-schema>> ;
sh:select """SELECT DISTINCT ?prop
WHERE {
?property rdfs:subPropertyOf*
c223:hasProperty .
$this ?property ?prop .
}""" ;
] ;
] ;
.
I know the following is wrong, but not sure what sh: calls I
should be using:
c223:PropertiesShape
rdf:type sh:PropertyShape ;
sh:path c223:hasProperty ;
sh:name "PropertiesShape" ;
sh:values [
sh:distinct [
sh:nodes [
sh:path (
[
sh:zeroOrMorePath rdfs:subPropertyOf ;
]
c223:hasProperty
) ;
] ;
] ;
] ;
.
This gives me a "malformed SHACL expression", so there are
definitely problems.
My real question is, how does one duplicate this pattern in SHACL?:
WHERE {
?property rdfs:subPropertyOf*
<parentProperty> .
$this ?property ?result .
}
Steve
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