How to get all properties for only a specific category in Wikidata? - sparql

Question

Is there an RDF data/other format that allow me to get all the properties that can exist in a category e.g. Person, then I should be returned properties like sex, date of birth.
How to query this information at https://query.wikidata.org/ ?
What I want is this https://www.wikidata.org/wiki/Wikidata:List_of_properties/Summary_table
But is there a better format for this? I want to access programmatically.
UPDATE
This query is too heavy, causes timeout.
SELECT ?p ?attName WHERE {
?q wdt:P31 wd:Q5.
?q ?p ?statement.
?realAtt wikibase:claim ?p.
?realAtt rdfs:label ?attName.
FILTER(((LANG(?attName)) = "en") || ((LANG(?attName)) = ""))
}
GROUP BY ?p ?attName
I must specify the entity, e.g. to Barrack Obama then it works, but this does not give me the all possible properties.
SELECT ?p ?attName WHERE {
BIND(wd:Q76 AS ?q)
?q wdt:P31 wd:Q5.
?q ?p ?statement.
?realAtt wikibase:claim ?p.
?realAtt rdfs:label ?attName.
FILTER(((LANG(?attName)) = "en") || ((LANG(?attName)) = ""))
}
GROUP BY ?p ?attName

Answer 1

1
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2
Perhaps the bot relies on the wd:P1963 property:
SELECT ?property ?propertyLabel {
VALUES (?class) {(wd:Q5)}
?class wdt:P1963 ?property
SERVICE wikibase:label { bd:serviceParam wikibase:language "en" }
} ORDER BY ASC(xsd:integer(strafter(str(?property), concat(str(wd:), "P"))))
The above query returns 49 results.
3
I'd suggest you rely on type constraints from property pages:
SELECT ?property ?propertyLabel {
VALUES (?class) {(wd:Q5)}
?property a wikibase:Property .
?property p:P2302 [ ps:P2302 wd:Q21503250 ;
pq:P2309 wd:Q21503252 ;
pq:P2308 ?class ] .
SERVICE wikibase:label { bd:serviceParam wikibase:language "en" }
} ORDER BY ASC(xsd:integer(strafter(str(?property), concat(str(wd:), "P"))))
The above query returns 700 results.
4
The first query from your question works fine for relatively small classes, e. g. wd:Q6256 ('country'). On the public endpoint, it is not possible to make the query work for large classes.
However, you could split the query into small parts. In Python:
from wdqs import Client
from time import sleep
client = Client()
result = client.query("SELECT (count(?p) AS ?c) {?p a wikibase:Property}")
count = int(result[0]["c"])
offset = 0
limit = 50
possible = []
while offset <= count:
props = client.query("""
SELECT ?property WHERE {
hint:Query hint:optimizer "None" .
{
SELECT ?property {
?property a wikibase:Property .
} ORDER BY ?property OFFSET %s LIMIT %s
}
?property wikibase:directClaim ?wdt.
FILTER EXISTS {
?human ?wdt [] ; wdt:P31 wd:Q5 .
hint:Group hint:maxParallel 501 .
}
hint:Query hint:filterExists "SubQueryLimitOne" .
# SERVICE wikibase:label { bd:serviceParam wikibase:language "en" }
}
""" % (offset, limit))
for prop in props:
possible.append(prop['property'])
offset += limit
print (len(possible), min(offset, count))
sleep(0.25)
The last line of the output is:
2156 5154