I don't think its possible to do what I am asking using regular sparql path queries. I will ask here though in case someone has a great suggestion for me that I haven't tried.
So we have reified geosparql sfWithin and sfContains statements in a linkset. They look like this:
_:b1 rdf:subject :featureA1 ;
rdf:predicate geo:sfWithin ;
rdf:object :featureB301 .
_:b2 rdf:subject :featureB301 ;
rdf:predicate geo:sfContains ;
rdf:object :featureA1 .
_:b3 rdf:subject :featureB301 ;
rdf:predicate geo:sfWithin ;
rdf:object :featureC99 .
_:b4 rdf:subject :featureC99 ;
rdf:predicate geo:sfContains ;
rdf:object :featureB301 .
_:b5 rdf:subject :featureC99 ;
rdf:predicate geo:sfWithin ;
rdf:object :featureD4000 .
There are millions of these in our linkset, within a named graph in our larger graph.
I want to get something like "What are all the features that feature A1 is within?"
In a normal (non-reified) set of statements, we can do:
:featureA1 geo:sfWithin+ ?f .
I've tested that and it works as expected on a de-reified copy of the linkset, I get expected results of:
?f
--
:featureB301
:featureC99
:featureD4000
But I want to do a similar repeating path query on the original reified statements.
The closest I've got it something like this:
<http://example.org/featureA1> (^rdf:subject / rdf:object)+ ?f .
But that follows the sfContains statements as well as the sfWithins. I need just the sfWithin chain.
Attempting to fix I think I need to do something like this:
<http://example.org/featureA1> (^rdf:subject / rdf:predicate / ?p / ^rdf:predicate / rdf:object)+ ?f .
FILTER ( ?p = geo:sfWithin) .
But that doesn't work because you can't capture and compare a variable within a sparql path.
Related
I am in a learning phase of SPARQL. I am working with a Turtle file to extract some information. The condition is: if the exact synonym has a substring 'stroke' or 'Stroke', the query should return all the synonyms and rdfs:label.
I am using below query but getting no output:
prefix oboInOwl: <http://www.geneontology.org/formats/oboInOwl#>
prefix obo: <http://purl.obolibrary.org/obo/>
prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>
Select * where {
?s ?p ?o .
rdfs:label <http://www.geneontology.org/formats/oboInOwl#hasExactSynonym> "stroke"^^xsd:string
}
Below is the sample Turtle file:
### https://ontology.aaaa.com/aaaa/meddra_10008196
:meddra_10008196
rdf:type owl:Class ;
<http://www.geneontology.org/formats/oboInOwl#hasDbXref> "DOID:6713" , "EFO:0000712" , "EFO:0003763" , "HE:A10008190" ;
<http://www.geneontology.org/formats/oboInOwl#hasExactSynonym>
"(cva) cerebrovascular accident" ,
"Acute Cerebrovascular Accident" ,
"Acute Cerebrovascular Accidents" ,
"Acute Stroke" ,
"Acute Strokes" ;
rdfs:label "Cerebrovascular disorder"#en ;
:hasSocs "Nervous system disorders [meddra:10029205]" , "Vascular disorders [meddra:10047065]" ;
:uid "6e46da69b727e4e924c31027cdf47b8a" .
I am expecting this output:
(cva) cerebrovascular accident
Acute Cerebrovascular Accident
Acute Cerebrovascular Accidents
Acute Stroke
Acute Strokes
Cerebrovascular disorder
With this triple pattern, you are querying for rdfs:label as subject, not as predicate:
rdfs:label <http://www.geneontology.org/formats/oboInOwl#hasExactSynonym> "stroke"^^xsd:string
What you are asking with this is: "Does the resource rdfs:label have the property oboInOwl:hasExactSynonym with the string value 'stroke'?"
But you want to ask this about the class (e.g., :meddra_10008196), not rdfs:label:
?class oboInOwl:hasExactSynonym "stroke" .
Finding matches
As you don’t want to find only exact string matches, you can use CONTAINS:
?class oboInOwl:hasExactSynonym ?matchingSynonym .
FILTER( CONTAINS(?matchingSynonym, "stroke") ) .
As you want to ignore case, you can query lower-cased synonyms with LCASE:
?class oboInOwl:hasExactSynonym ?matchingSynonym .
FILTER( CONTAINS(LCASE(?matchingSynonym), "stroke") ) .
Displaying results
To display the label and all synonyms in the same column, you could use a property path with | (AlternativePath):
?class rdfs:label|oboInOwl:hasExactSynonym ?labelOrSynonym .
Full query
# [prefixes]
SELECT ?class ?labelOrSynonym
WHERE {
?class rdfs:label|oboInOwl:hasExactSynonym ?labelOrSynonym .
FILTER EXISTS {
?class oboInOwl:hasExactSynonym ?matchingSynonym .
FILTER( CONTAINS(LCASE(?matchingSynonym), "stroke") ) .
}
}
Given the following schema, "driver-passenger" lineages can be easily seen:
tp:trip a owl:Class ;
rdfs:label "trip"#en ;
rdfs:comment "an 'asymmetric encounter' where someone is driving another person."#en .
tp:driver a owl:ObjectProperty ;
rdfs:label "driver"#en ;
rdfs:comment "has keys."#en ;
rdfs:domain tp:trip ;
rdfs:range tp:person .
tp:passenger a owl:ObjectProperty ;
rdfs:label "passenger"#en ;
rdfs:comment "has drinks."#en ;
rdfs:domain tp:trip ;
rdfs:range tp:person .
Consider the following data:
<alice> a tp:person .
<grace> a tp:person .
<tim> a tp:person .
<ruth> a tp:person .
<trip1> a tp:trip ;
tp:participants <alice> , <grace> ;
tp:driver <alice> ;
tp:passenger <grace> .
<trip2> a tp:trip ;
tp:participants <alice> , <tim> ;
tp:driver <alice> ;
tp:passenger <tim> .
<trip3> a tp:trip ;
tp:participants <tim> , <grace> ;
tp:driver <tim> ;
tp:passenger <grace> .
<trip4> a tp:trip ;
tp:participants <grace> , <ruth> ;
tp:driver <grace> ;
tp:passenger <ruth> .
<trip5> a tp:trip ;
tp:participants <grace> , <tim> ;
tp:driver <grace> ;
tp:passenger <tim> .
Now let a "driver-passenger descendent" be any tp:passenger at the end of a trip sequence where the tp:passenger of one trip is the tp:driver of the next trip
Ex. <ruth> is a descendent of <alice> according to the following sequence of trips:
<trip2> -> <trip3> -> <trip4>.
Question:
How to get the (ancestor,descendent) pairs of all driver-passenger lineages?
Attempt 1:
I initially tried the following CONSTRUCT subquery to define an object property: tp:drove, which can be easily used in a property path. However, this did not work on my actual data:
SELECT ?originalDriver ?passengerDescendent
WHERE {
?originalDriver tp:drove+ ?passengerDescendent .
{
CONSTRUCT { ?d tp:drove ?p . }
WHERE { ?t a tp:trip .
?t tp:driver ?d .
?t tp:passenger ?p .}
}
}
Attempt 2:
I tried to create property path which expresses an ancestor as the driver of a passenger, but I don't think I've properly understood how this is supposed to work:
(tp:driver/^tp:passenger)+
Regarding MWE: Is there some kind of RDF sandbox that would allow me to create an MWE by defining a simple ontology like tp above, along with some sample data? The following "playgrounds" are available but none of them seem to support defining a toy ontology: SPARQL Playground, SPARQL Explorer.
Notes on related content:
This question is directly related to a previous question, but no longer requires saving the paths themselves, a feature not directly supported by SPARQL 1.1.
This answer by Joshua Taylor seems relevant, but doesn't address the identification of specific types of paths, such as the lineages defined above.
This one seems to do the trick:
select ?driver ?passenger where {
?driver (^tp:driver/tp:passenger)+ ?passenger .
filter( ?driver != ?passenger)
}
The filter condition can be removed if you want to also see relationships that lead back to the same person.
I'm trying to query a dataset which uses the RDF reification vocabulary, something like this:
myprefix:statement1 rdf:subject myprefix:object1 .
myprefix:statement1 rdf:predicate myprefix:isrelatedto .
myprefix:statement1 rdf:object myprefix:object2 .
myprefix:statement2 rdf:subject myprefix:object2 .
myprefix:statement2 rdf:predicate myprefix:isrelatedto .
myprefix:statement2 rdf:object myprefix:object3 .
prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
prefix myprefix: <mydomain#>
select *
from <mydomain>
where {
[ rdf:subject ?first ; rdf:predicate myprefix:isrelatedto ; rdf:object _:1 ] .
[ rdf:subject _:1 ; rdf:predicate myprefix:isrelatedto ; rdf:object ?second ] .
}
Result:
__________________ __________________
| first | second |
|__________________|__________________|
| myprefix:object1 | myprefix:object2 |
|__________________|__________________|
Can I replace the labelled blank node _:1 with the [ ] construction somehow?
EDIT: Should explain that the reason for the question was that in the real use case I have a much more complex query that needs to get a variable number of properties like this (the query is generated dynamically). So what I'm trying to do is get rid of the labelled node so that I don't have to generate unique labels dynamically.
[ ] works when there is at most one reference to it.
Here we have:
... rdf:object _:1
... rdf:subject _:1
so two references to the blank node as currently written.
If you can modify the rest of the query, it may be possible. Whether the intent is clearer is something you'll have to make a judgement on.
Because in the part:
[ rdf:subject _:1 ; ....]
isn't using the outer [ ] blank node for anything so it might be possible to have rdf:object/^rdf:subject as suggested in the comment.
Whether the intent is clearer is something you'll have to make a judgement on.
I'm having a problem with SPARQL when dealing with numeric data types.
I have an ontology (http://cabas.ugr.es/ontology/ugr) in which I have defined a pair of properties that represent the number of students who are of a particular sex:
<http://cabas.ugr.es/ontology/ugr#hombres>
a owl:DatatypeProperty, owl:FunctionalProperty, rdf:Property ;
rdfs:label
"hombres"#es,
"men"#en ;
rdfs:comment
"Número de estudiantes hombres."#es,
"Number of male students."#en ;
rdfs:range xsd:nonNegativeInteger ;
rdfs:isDefinedBy <http://cabas.ugr.es/ontology/ugr#> ;
owl:sameAs <http://cabas.ugr.es/ontology/ugr#hombres> ;
owl:inverseOf <http://cabas.ugr.es/ontology/ugr#mujeres> ;
ns1:term_status "stable" .
<http://cabas.ugr.es/ontology/ugr#mujeres>
a owl:DatatypeProperty, owl:FunctionalProperty, rdf:Property ;
rdfs:label
"mujeres"#es,
"women"#en ;
rdfs:comment
"Número de estudiantes mujeres."#es,
"Number of female students."#en ;
rdfs:range xsd:nonNegativeInteger ;
rdfs:isDefinedBy <http://cabas.ugr.es/ontology/ugr#> ;
owl:sameAs <http://cabas.ugr.es/ontology/ugr#mujeres> ;
owl:inverseOf <http://cabas.ugr.es/ontology/ugr#hombres> ;
ns1:term_status "stable" .
I have a SPARQL endpoint mounted on Virtuoso (http://cabas.ugr.es:8890/sparql), in which I enter for example the following query:
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX ugr: <http://cabas.ugr.es/ontology/ugr#>
SELECT ?X ?titulacion ?rama ?hombres ?mujeres
WHERE {
?X ugr:Titulación ?titulacion .
?X ugr:RamaConocimiento ?rama .
?X ugr:hombres ?hombres .
?X ugr:mujeres ?mujeres
}
(Which would correspond with this link)
It returns all the records, but the fields "hombres" and "mujeres" returns them to me as if it were a string instead of a numeric value, so for example it is impossible to apply a filter like FILTER (?hombres > 500). Any idea what I'm wrong about?
By the way, the ontology and the resource with the values are accessible through these links:
Ontology:
Turtle Format:
http://cabas.ugr.es/ontology/ugr
http://cabas.ugr.es/ontology/ugr.ttl
RDF/XML Format:
http://cabas.ugr.es/ontology/ugr.rdf
Resource:
Turtle Format:
http://cabas.ugr.es/resources/MatriculasGrado1516
http://cabas.ugr.es/resources/matriculas_grado_1516.ttl
RDF/XML Format:
http://cabas.ugr.es/resources/matriculas_grado_1516.rdf
In order to treat the numbers as numbers, you need to define them as such.
Right now you define them as strings:
<http://cabas.ugr.es/resources/MatriculasGrado1516#21>
ns0:hombres "91" ;
ns0:mujeres "68" .
To define them as integers, you need to set their type to xsd:integer:
<http://cabas.ugr.es/resources/MatriculasGrado1516#21>
ns0:hombres "91"^^xsd:integer ;
ns0:mujeres "68"^^xsd:integer .
Strings can also be cast to integer in queries, if needed. For example:
FILTER(xsd:integer(?hombres) > 500)
I have such a query:
CONSTRUCT {
?p a :IndContainer .
?p :contains ?ind .
} WHERE{
:ClassContainer_1 :contains ?class .
?ind a ?class .
BIND (IRI(...) AS ?p) .
}
An individual ClassContainer_1 relates to some classes. I get this classes and try to find individuals for these classes. Then I try to create an IndContainer that should store found individuals (dots are used only for simplification). So, I want to:
Create individual of IndContainer only when individuals for all bindings of ?class have been found;
Create individuals of IndContainer for all possible sets of individuals from ?ind (i.e. when some of ?class has a nuber of individuals).
Is it possible to create such a SPARQL query? Or it is necessary to use some rule engine?
EDIT (add illustration):
Positive example. Have:
test:ClassContainer_1
rdf:type test:ClassContainer ;
test:contains test:Type1 ;
test:contains test:Type2 ;
.
test:Type1_1
rdf:type test:Type1 ;
.
test:Type1_2
rdf:type test:Type1 ;
.
test:Type2_1
rdf:type test:Type2 ;
.
Want to receive:
test:IndContainer_1
rdf:type test:IndContainer ;
test:contains test:Type1_1 ;
test:contains test:Type2_1 ;
.
test:IndContainer_2
rdf:type test:IndContainer ;
test:contains test:Type1_2 ;
test:contains test:Type2_1 ;
.
Negative example: the same as positive except that there is no individuals of class Type2 and so no individuals of IndContainer should be generated.
EDIT 2 (problem essence):
We may look at this problem from the perspective of combination composing. We have two positions (in my example) in each combination. The number of positions is determined by the number of classes each ClassContainer depends on. Each position must be filled in with one individual of a class that correspond to that position. So in my example first position must be filled with one individual of Type1 class, the second - with Type2 class (but the order does not matter). We have two individuals for the first class and one individual for the second class. To get the number of combinations we may use the rule of product from combinatorics - 2*1 = 2, i.e. {Type1_1,Type2_1} - is the first combination and {Type1_2,Type2_1} - is the second combination. For each combination it is necessary to generate IndContainer individual.
If I understand your question correctly, you want a "container" for each class that is contained in a "class container" that contains the individuals that belong to that class. That's not too hard to do, as long as you can construct the IRI of the container from the IRI of the class. Here's some sample data with two classes, A and B, and a few instances (some of just A, some of just B, and some of A and B):
#prefix : <urn:ex:> .
:container a :ClassContainer ;
:contains :A, :B .
:w a :A . # an :A
:x a :A . # another :A
:y a :B . # a :B
:z a :A, :B . # both an :A and a :B
You query is already pretty close. Here's one that works, along with its result:
prefix : <urn:ex:>
construct {
?indContainer a :IndContainer ;
:contains ?ind .
}
where {
:container a :ClassContainer ;
:contains ?class .
?ind a ?class .
bind(IRI(concat(str(?class),"-container")) as ?indContainer)
}
#prefix : <urn:ex:> .
:B-container a :IndContainer ;
:contains :y , :z .
:A-container a :IndContainer ;
:contains :w , :x , :z .