i am working on protege 5.0 tool i downloaded the ontologies i.e doid.owl and cpr.owl which is freely downloadable from the web then i merged them. and i tried querying the ontologies using a SPARQL query the basic "select *" query is working but for retrieving the individuals, i have a query which is not working.. since cpr.owl is the benchmark i merged the ontology into that
the query is:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX rs:<http://purl.obolibrary.org/obo/doid.owl>
PREFIX ab: <http://purl.org/cpr/0.9>
SELECT ?name ?age ?address
WHERE
{ ?person ab:hasDisease "heart_cancer";
ab:Name ?name ;
ab:Age ?age ;
ab:Address ?address. }
Related
Please help me with the SPARQL query. I have an ontology with the class 'Verse' as a subclass of owl:Thing.
The Individuals look like this:
I need to do a SPARQL query, which will retrieve all the individuals according to the Verse (class name).
I have tried this, but it seems like this query is wrong:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX owl: <http://www.w3.org/2002/07/owl#>
SELECT ?individual ?class
WHERE {
?individual rdf:type owl:NamedIndividual .
?class rdf:type owl:Class .
}
ps: for download my ontology data, here
You can directly use the class name from your ontology.
PREFIX ontobible: <ur ontology IRI>
SELECT ?individual
WHERE {
?individual a ontobible:Verse .
}
Can somebody help me please with SPARQL Federated, because I can't understand it syntax.
For example I have my own local ontology (museum domen) and there are some data regarding weather I find this https://dbpedia.org/page/Weather_forecasting.
How can I view information from this ontology (weather and date, for example) and my ontology (excursion and date)?
I tried to create request here https://query.wikidata.org/#SELECT%20DISTINCT%20%3Fitem%20%3FitemLabel%20WHERE%20%7B%0A%20%20SERVICE%20wikibase%3Alabel%20%7B%20bd%3AserviceParam%20wikibase%3Alanguage%20%22%5BAUTO_LANGUAGE%5D%22.%20%7D%0A%20%20%7B%0A%20%20%20%20SELECT%20DISTINCT%20%3Fitem%20WHERE%20%7B%0A%20%20%20%20%20%20%3Fitem%20p%3AP4150%20%3Fstatement0.%0A%20%20%20%20%20%20%3Fstatement0%20%28ps%3AP4150%29%20_%3AanyValueP4150.%0A%20%20%20%20%7D%0A%20%20%20%20LIMIT%20100%0A%20%20%7D%0A%7D but it does not work in Protege.
I tried to create request in Protege:
*** PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX foaf: <http://www.menthor.net/myontology#>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
SELECT ?date ?excursion
FROM <https://dbpedia.org/page/Weather_forecasting>
WHERE <http://www.menthor.net/myontology> foaf: ?excursion .
SERVICE <https://dbpedia.org/page/Weather_forecasting/sparql> {
?date foaf:date ?date . ***
but it does not work again
What prefixes should I have? Can I get data from this link https://dbpedia.org/page/Weather_forecasting in Protege?
enter image description here I can get data from my ontology, but do not understand how to use dbpedia data
I have this query
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX dbpedia: <http://dbpedia.org/>
PREFIX dbpedia_property: <http://dbpedia.org/property/>
PREFIX dbpedia_ontology: <http://dbpedia.org/ontology/>
PREFIX yago: <http://dbpedia.org/class/yago/>
PREFIX schema: <http://schema.org/>
SELECT * WHERE
{
{
SELECT ?school
WHERE
{
?school rdf:type yago:EducationalInstitution108276342 .
FILTER ( contains(str(?school), "Australia") )
}
ORDER BY ?school
}
}
Don't mind the extra brackets as this is part of a larger query.
What I want to know is why thi http://dbpedia.org/page/Academic_structure_of_the_Australian_National_University is included in the results since I specify rdf:type yago:EducationalInstitution108276342. This property is not included in the resource page. I'm using this endpoint: http://dbpedia.org/sparql
Looks like a bug in the Pubby Web interface or in the query that is used to get the data that will be shown.
The query
SELECT * WHERE{
<http://dbpedia.org/resource/Academic_Structure_of_the_Australian_National_University> ?p ?o
}
returns the necessary rdf:type statement.
The other strange thing is that even a SPARQL DESCRIBE query does not return the rdd:type triples:
DESCRIBE <http://dbpedia.org/resource/Academic_Structure_of_the_Australian_National_University>
Although DESCIBE is not really defined in the specs, a user would expect those triples for sure. And maybe this kind of query is used to retrieve the data for the Web pages of resources.
I have a question about polymorphism in RDF schema.
I created a class "MobilePhone":
#prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
#prefix schema: <http://schema.org/> .
#prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
#prefix my: <http://localhost/> .
my:MobilePhone rdf:type rdfs:Class .
my:MobilePhone rdfs:subClassOf schema:Product .
my:MobilePhone rdfs:label "MobilePhone" .
Then I executed two queries:
PREFIX : <http://schema.org/>
PREFIX my: <http://localhost/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT ?instance
WHERE {
?instance a my:MobilePhone .
}
and
PREFIX : <http://schema.org/>
PREFIX my: <http://localhost/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT ?instance
WHERE {
?instance a :Product .
}
I expected the second query to retrieve all Products. Even "MobilePhone" products. But that didn't happen. I had to use:
PREFIX : <http://schema.org/>
PREFIX my: <http://localhost/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT ?instance
WHERE {
?class rdfs:subClassOf* :Product .
?instance rdf:type ?class .
}
Does anyone know if it is possible to update my schema so the first query for searching all Products would work?
It is possible to update your data (not your schema [or ontology]) to deliver the desired result, by "forward chaining" -- i.e., by explicitly including statements that each entity which is a my:MobilePhone is also a :Product.
It's also possible to use "backward chaining" to deliver the desired result; the specifics of this will vary with your triple/quad store and other software. (My employer's solution, Virtuoso, uses a DEFINE input:inference pragma to activate an inference rule set for each query.)
Both of these may be considered as "inferencing" or "reasoning", though common usage generally applies these terms only to the dynamic action -- which happens with every query in "backward chaining", and once, pre-query, typically during data load, in "forward chaining".
I am learning how to create SPARQL queries. Currently, I am using Dbpedia datasets.
I tried to query about "What are the airports that are in Canada" with the following query:
PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX : <http://dbpedia.org/resource/>
PREFIX dbpedia2: <http://dbpedia.org/property/>
PREFIX dbpedia: <http://dbpedia.org/>
PREFIX skos: <http://www.w3.org/2004/02/skos/core#>
SELECT ?name ?country WHERE {
?name rdf:type <http://dbpedia.org/ontology/Airport>;
?name rdf:type <http://dbpedia.org/ontology/Country>
}
LIMIT 20
I am still confused about building SPARQL queries especially with resources and RDF graphs.
What I need is what is the mistake with the above query?
Thanks
The query you are looking for is something like:
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX dbpedia-owl: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?airport ?label WHERE {
?airport rdf:type <http://dbpedia.org/ontology/Airport>;
rdfs:label ?label;
dbpedia-owl:location <http://dbpedia.org/resource/Canada> .
}
This query however doesn't return much results and you would be better of with something like:
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX dbpedia-owl: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?airport ?label WHERE {
?airport rdf:type <http://dbpedia.org/class/yago/AirportsInOntario> ;
rdfs:label ?label .
}
There are various things wrong in your initial query that imply that you should get a better understanding of SPARQL. You need to revise the way you construct the triple patterns. I recommend you to have a look at the following tutorial:
http://www.cambridgesemantics.com/2008/09/sparql-by-example/
Also you will find exploratory SPARQL queries tremendously helpful:
exploratory SPARQL queries?
Your query is currently asking for objects (resources) that have type Airport AND have type Country. Needless to say, there are no results.
You query is also asking for ?country which is completely undefined.
See msalvadores' answer for a correct example...