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

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 bi

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