new to SPARQL. Trying to figure out why I get different results on these two queries. It's based on this other question, where I'm trying to match properties to a name of a person. For example, I'm curious to know the birthday of J.K. Rowling, without knowing her URI directly. Here's the code from the link above:
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX dbo: <http://dbpedia.org/ontology/>
SELECT DISTINCT *
WHERE
{
?item rdfs:label ?itemLabel .
FILTER ( ?itemLabel = "Car"#en ) .
?item dbo:abstract ?itemDescription .
FILTER (lang(?itemDescription) = 'en')
}
ORDER BY ?itemLabel
compared to the query I'd like with J.K.:
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX dbo: <http://dbpedia.org/ontology/>
SELECT DISTINCT *
WHERE
{
?item rdfs:label ?itemLabel .
FILTER ( ?itemLabel = "J.K. Rowling"#en ) .
?item dbo:abstract ?itemDescription .
FILTER (lang(?itemDescription) = 'en')
}
ORDER BY ?itemLabel
The first one works fine, however, when I replace "Car" with "J.K. Rowling" as in the second, nothing is returned (her URI is return if I remove the dbo:abstract line and the filter line for it). J.K. Rowling does have a dbo:abstract in English. I'm not sure why it works for one and not the other. The only thing I can see that that 'Car' is a 'Thing', while J.K. is a 'person'
Related
i want to display the countries with their net value/income or something similiar through accessing the data through DBPedia. and further insert them into an already created table.
Unfortunately i dont get any results with my code.
Try the following query to list the type of entities that has a dbp:income as a property. you will notice that dbo:Country is not the list, that's why the result you got was empty.
prefix dbp: <http://dbpedia.org/property/>
select distinct ?type
where {
?s a ?type.
?s dbp:income ?income
}
My suggestion is to use dbp:gdpNominal instead of the dbp:income property in your query :
prefix dbp: <http://dbpedia.org/property/>
prefix dbo: <http://dbpedia.org/ontology/>
select distinct ?country_name ?income
where {
?country a dbo:Country.
?country rdfs:label ?country_name. FILTER (lang(?country_name) = 'en')
?country dbp:gdpNominal ?income.
}
I am working from this example, and I want to archieve the same, however with a different topic - Climate change
All i need to output is the abstract from this page: http://dbpedia.org/page/Climate_change
PREFIX dbp-res: <http://dbpedia.org/resource/>
PREFIX dbp-ont: <http://dbpedia.org/ontology/>
PREFIX dbp-prop: <http://dbpedia.org/property/>
SELECT *
WHERE
{
?Resource a dbp-ont:Agent .
?Resource dbp-ont:abstract ?Description .
?Resource rdfs:label ?Label .
FILTER( STR(?Label) = 'Climate_change' )
FILTER (langMatches(lang(?Description),'en'))
FILTER (langMatches(lang(?Label),'en'))
}
The problem seems to be the Agent, but I have no clue, as to what to replace it with.
My query
I am currently trying to run my query but I keep getting the error that in line 0 the parentheses are not balanced at '}'
I have checked my whole code multiple times, but I don't seem to get it fixed. I am currently using the dbpedia endpoint.
PREFIX dbo: <http://dbpedia.org/ontology/>
PREFIX yago: <http://dbpedia.org/class/yago/>
PREFIX dbp: <http://dbpedia.org/property/>
PREFIX dct: <http://purl.org/dc/terms/>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
SELECT DISTINCT ?country ?government ?population
WHERE{ ?country dct:subject <http://dbpedia.org/resource>/Category:Countries_in_Europe> ;
rdfs:label ?country;
dbo:government ?government.
?government rdfs:label ?government.
?population rdfs:subClassOf* dbo:PopulatedPlace
rdf:type dbpedia-owl:Country;
rdfs:label ?country ;
prop:populationEstimate ?population .
FILTER (?population < 3000000) .
FILTER ( lang(?country) AND (lang(?(government = 'en')
}
Three rows in the graph should be shown, First with the country as a title, second with the governmenttypes of the countries as a title and the 3rd should be a row with the population descending from the total of 3000000.
Thanks alot in advance for helping me out!
You have multiple errors in this query.
Several things that pop out at me.
Thing 1 --
?government rdfs:label ?government.
You've got several similar ?subject ?predicate ?subject constructions.
Thing 2 --
?population rdfs:subClassOf* dbo:PopulatedPlace
rdf:type dbpedia-owl:Country;
I think you need a semicolon after dbo:PopulatedPlace
Thing 3 --
FILTER ( lang(?country) AND (lang(?(government = 'en')
That FILTER breaks syntax several ways. I think this will do what you intend --
FILTER ( lang(?country) = 'en') .
FILTER ( lang(?government) = 'en') .
Thing 4 --
<http://dbpedia.org/resource>/Category:Countries_in_Europe>
You've got an extra > in mid-string.
Thing 5 --
dbpedia-owl:Country
I think that should be dbo:Country
Thing 6 --
prop:populationEstimate
I think that should be dbp:populationEstimate
There are MANY more issues... I am not sure you're really trying.
I'm trying to extract entity dictionary contains person name etc. from dbpedia using sparql.
PREFIX owl: <http://dbpedia.org/ontology/>
PREFIX dbpprop: <http://dbpedia.org/property/>
SELECT ?name
WHERE {
?person a owl:Person .
?person dbpprop:name ?name . FILTER(lang(?name) = "en")
}
The query above did succeed, but when I change the language name to fr, there is nothing to fetch.
How can I fetch names in other languages?
Moreover, why can't I filter language using query below?
SELECT ?name
WHERE {
?person a owl:Person .
?person dbpprop:language "English"
?person dbpprop:name ?name .
}
// this query returns nothing
I tried to fetch all languages using
SELECT DISTINCT ?lanName
WHERE {
?person a owl:Person .
?person dbpprop:language ?lanName .
}
and the result set contains English.
You need to filter based on the language of the value of the property. Not every property will have values in different languages, but some properties will. It seems, from your example, that dbpprop:name doesn't have values in every language. You may find more values in other languages if you look on the other language specific DBpediae.
However, for something like a name, you'll probably get multi-language results if you use the rdfs:label property. For instance, to get the names of Barack Obama, Daniel Webster, and Johnny Cash in Russian, you could do:
select ?label {
values ?person { dbpedia:Johnny_Cash dbpedia:Barack_Obama dbpedia:Daniel_Webster }
?person rdfs:label ?label .
filter langMatches(lang(?label),"ru")
}
SPARQL results
As an aside, note the use of langMatches rather than equality for matching language tags. This is usually a better approach, because it will correctly handle the different language tags within a language For example (from the SPARQL specification), you can find both of the French literals:
"Cette Série des Années Soixante-dix"#fr .
"Cette Série des Années Septante"#fr-BE .
with langMatches(lang(?title),"fr"), but only the first one with lang(?title) = "fr".
You are looking for rdfs:label for a name, of course all the names are English, you are looking at the English dbpedia.
PREFIX owl: <http://dbpedia.org/ontology/>
PREFIX dbpprop: <http://dbpedia.org/property/>
SELECT distinct *
WHERE {
?person a owl:Person .
?person rdfs:label ?name .
FILTER(lang(?name) = "fr")
}
Again, for the second one, if you replace the name with the rdfs: label you can have:
PREFIX owl: <http://dbpedia.org/ontology/>
PREFIX dbpprop: <http://dbpedia.org/property/>
SELECT distinct *
WHERE {
?person a owl:Person .
?person rdfs:label ?name .
?person dbpprop:language <http://dbpedia.org/resource/English_language>.
}
I'm trying to use a SPARQL query to retrieve information about a DBpedia resource (a Person). I'd like to use the same query to retrieve data about any Person by parameterizing the resource URI. Since some attributes may not exist for a particular resource, I'm making use of the OPTIONAL statement. Here is my query:
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX dbo: <http://dbpedia.org/ontology/>
PREFIX dbpprop: <http://dbpedia.org/property/>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
SELECT DISTINCT ?label ?abstract ?placeOfBirth
?birthPlace ?birthDate ?deathDate ?page ?thumbnail
WHERE {
<http://dbpedia.org/resource/Neil_Simon> rdfs:label ?label ;
dbo:abstract ?abstract ;
foaf:page ?page .
OPTIONAL {
<http://dbpedia.org/resource/Neil_Simon> dbpprop:placeOfBirth ?placeOfBirth ;
dbpprop:birthPlace ?birthPlace ;
dbo:birthDate ?birthDate ;
dbo:deathdate ?deathDate ;
dbo:thumbnail ?thumbnail .
}
FILTER (LANG(?label) = 'en')
FILTER (LANG(?abstract) = 'en')
}
LIMIT 1
I've left everything except label, abstract and page in OPTIONAL, since if I use the same query for another person, they may not have those properties. The problem is, none of those optional attributes are showing up in the results. In Neil Simon's case, you can see that there are values for birthDate, birthPlace and thumbnail: http://dbpedia.org/resource/Neil_Simon. However, those values don't show up when I run the query: DBpedia SPARQL query. What am I doing wrong, and how can I optionally retrieve those properties?
Although you have used an OPTIONAL construct the map pattern itself needs all the attributes within to match. So only if you have birthPlace, birthDate, deathDate and thumbnail the inner optional construct is satisfied
I would suggest breaking the OPTIONAL construct up into multiple OPTIONAL constructs.