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Posted to users@jena.apache.org by Mikael Pesonen <mi...@lingsoft.fi> on 2022/12/12 12:49:08 UTC
How to handle optional lists in SPARQL
Is there a shortcut for making queries where a data value can be single
item or list of items?
For example this is how I do a query now using UNION. Both parts are
identical except for the single/list section in owl:someValuesFrom [].
This is still somewhat readable but if there are multiple occurences,
query lenght and complexity grows exponentially.
{
?finding owl:equivalentClass|rdfs:subClassOf [
owl:intersectionOf [
list:member [
rdf:type owl:Restriction ;
owl:onProperty id:609096000 ;
owl:someValuesFrom [
rdf:type owl:Restriction ;
owl:onProperty id:363698007 ;
owl:someValuesFrom ?site
]
]
]
]
}
UNION
{
?finding owl:equivalentClass|rdfs:subClassOf [
owl:intersectionOf [
list:member [
rdf:type owl:Restriction ;
owl:onProperty id:609096000 ;
owl:someValuesFrom [
owl:intersectionOf [
list:member [
rdf:type owl:Restriction ;
owl:onProperty id:363698007 ;
owl:someValuesFrom ?site
]
]
]
]
]
]
}
The data is not ours so we can't make everything lists.
Re: How to handle optional lists in SPARQL
Posted by Mikael Pesonen <mi...@lingsoft.fi>.
Hi, thanks for the suggestion! I didn't think of property paths.
So in case of just optional list /list:member? works fine. And for my
more complicated case as you wrote.
On 12/12/2022 17.08, Lorenz Buehmann wrote:
> I don't know your full query restrictions, but without given
> properties it would be a "simple" property path, no? Something like
>
> owl:someValuesFrom/((owl:intersectionOf|owl:unionOf)/list:member)?
>
> where the list closure is optional and if you want to make it nestested
>
> (owl:someValuesFrom/((owl:intersectionOf|owl:unionOf)/list:member)?)*
>
> So a query like
>
> prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>
> prefix owl: <http://www.w3.org/2002/07/owl#>
> prefix list: <http://jena.apache.org/ARQ/list#>
>
> select * {
> ?subclass rdfs:subClassOf|owl:equivalentClass
> [(owl:intersectionOf|owl:unionOf)/list:member/(owl:someValuesFrom/((owl:intersectionOf|owl:unionOf)/list:member)?)*
> ?m]
> FILTER(isIRI(?m))
> }
>
> could work. You could even try to make it more generic.
>
>
> But maybe you have different requirements, in that case it would be
> easier to help with sample data. My sample data now was
>
> @prefix :
> <http://www.semanticweb.org/user/ontologies/2022/11/untitled-ontology-100#>
> .
> @prefix owl: <http://www.w3.org/2002/07/owl#> .
> @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
> @prefix xml: <http://www.w3.org/XML/1998/namespace> .
> @prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
> @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
>
> :Foo rdf:type owl:Class ;
> owl:equivalentClass [ rdf:type owl:Class ;
> owl:unionOf ( :A
> [ rdf:type owl:Restriction ;
> owl:onProperty :p ;
> owl:someValuesFrom [
> rdf:type owl:Class ;
> owl:unionOf ( :B
> [ rdf:type owl:Restriction ;
> owl:onProperty :q ;
> owl:someValuesFrom :C
> ]
> )
> ]
> ]
> )
> ] .
>
>
> Cheers,
>
> Lorenz
>
> On 12.12.22 13:49, Mikael Pesonen wrote:
>>
>> Is there a shortcut for making queries where a data value can be
>> single item or list of items?
>>
>> For example this is how I do a query now using UNION. Both parts are
>> identical except for the single/list section in owl:someValuesFrom
>> []. This is still somewhat readable but if there are multiple
>> occurences, query lenght and complexity grows exponentially.
>>
>> {
>> ?finding owl:equivalentClass|rdfs:subClassOf [
>> owl:intersectionOf [
>> list:member [
>> rdf:type owl:Restriction ;
>> owl:onProperty id:609096000 ;
>> owl:someValuesFrom [
>> rdf:type owl:Restriction ;
>> owl:onProperty id:363698007 ;
>> owl:someValuesFrom ?site
>> ]
>> ]
>> ]
>> ]
>> }
>> UNION
>> {
>> ?finding owl:equivalentClass|rdfs:subClassOf [
>> owl:intersectionOf [
>> list:member [
>> rdf:type owl:Restriction ;
>> owl:onProperty id:609096000 ;
>> owl:someValuesFrom [
>> owl:intersectionOf [
>> list:member [
>> rdf:type owl:Restriction ;
>> owl:onProperty id:363698007 ;
>> owl:someValuesFrom ?site
>> ]
>> ]
>> ]
>> ]
>> ]
>> ]
>> }
>>
>> The data is not ours so we can't make everything lists.
--
Lingsoft - 30 years of Leading Language Management
www.lingsoft.fi
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Mikael Pesonen
Semantic Technologies
e-mail: mikael.pesonen@lingsoft.fi
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Re: How to handle optional lists in SPARQL
Posted by Lorenz Buehmann <bu...@informatik.uni-leipzig.de>.
I don't know your full query restrictions, but without given properties
it would be a "simple" property path, no? Something like
owl:someValuesFrom/((owl:intersectionOf|owl:unionOf)/list:member)?
where the list closure is optional and if you want to make it nestested
(owl:someValuesFrom/((owl:intersectionOf|owl:unionOf)/list:member)?)*
So a query like
prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>
prefix owl: <http://www.w3.org/2002/07/owl#>
prefix list: <http://jena.apache.org/ARQ/list#>
select * {
?subclass rdfs:subClassOf|owl:equivalentClass
[(owl:intersectionOf|owl:unionOf)/list:member/(owl:someValuesFrom/((owl:intersectionOf|owl:unionOf)/list:member)?)*
?m]
FILTER(isIRI(?m))
}
could work. You could even try to make it more generic.
But maybe you have different requirements, in that case it would be
easier to help with sample data. My sample data now was
@prefix :
<http://www.semanticweb.org/user/ontologies/2022/11/untitled-ontology-100#>
.
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix xml: <http://www.w3.org/XML/1998/namespace> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
:Foo rdf:type owl:Class ;
owl:equivalentClass [ rdf:type owl:Class ;
owl:unionOf ( :A
[ rdf:type owl:Restriction ;
owl:onProperty :p ;
owl:someValuesFrom [
rdf:type owl:Class ;
owl:unionOf ( :B
[ rdf:type owl:Restriction ;
owl:onProperty :q ;
owl:someValuesFrom :C
]
)
]
]
)
] .
Cheers,
Lorenz
On 12.12.22 13:49, Mikael Pesonen wrote:
>
> Is there a shortcut for making queries where a data value can be
> single item or list of items?
>
> For example this is how I do a query now using UNION. Both parts are
> identical except for the single/list section in owl:someValuesFrom [].
> This is still somewhat readable but if there are multiple occurences,
> query lenght and complexity grows exponentially.
>
> {
> ?finding owl:equivalentClass|rdfs:subClassOf [
> owl:intersectionOf [
> list:member [
> rdf:type owl:Restriction ;
> owl:onProperty id:609096000 ;
> owl:someValuesFrom [
> rdf:type owl:Restriction ;
> owl:onProperty id:363698007 ;
> owl:someValuesFrom ?site
> ]
> ]
> ]
> ]
> }
> UNION
> {
> ?finding owl:equivalentClass|rdfs:subClassOf [
> owl:intersectionOf [
> list:member [
> rdf:type owl:Restriction ;
> owl:onProperty id:609096000 ;
> owl:someValuesFrom [
> owl:intersectionOf [
> list:member [
> rdf:type owl:Restriction ;
> owl:onProperty id:363698007 ;
> owl:someValuesFrom ?site
> ]
> ]
> ]
> ]
> ]
> ]
> }
>
> The data is not ours so we can't make everything lists.