query-8d82aff51b5ee79035f6b0309423b708

rq turtle/ttl

Approach 2:

Use at

PREFIX schema: <http://schema.org/>
SELECT (COUNT(DISTINCT(?item)) AS ?count) 
WHERE {
   { 
       SELECT ?item (SAMPLE(?sitelink) AS ?sl) WHERE {
           ?sitelink schema:about ?item .
       } GROUP BY ?item
       HAVING (COUNT(?sitelink) = 1)
   }
   ?sl schema:isPartOf <https://commons.wikimedia.org/>.
   FILTER (STRSTARTS(str(?sl), "https://commons.wikimedia.org/wiki/Category:")) . 
}

Query found at

graph TD classDef projected fill:lightgreen; classDef literal fill:orange; classDef iri fill:yellow; v4("?_anon_42b5416610844a34809f33a099ae9de147183") v5("?count") v3("?item"):::projected v2("?sitelink") v5("?sl") a1((" ")) c5([https://commons.wikimedia.org/]):::iri f0[["starts-with(str(?sl),'https://commons.wikimedia.org/wiki/Category:')"]] f0 --> v5 f1[[" = '1^^xsd:integer'"]] f1 --> a1 v2 --"schema:about"--> v3 bind4[/"count(?sitelink)"/] v2 --o bind4 bind4 --as--o v4 bind5[/"sample(?sitelink)"/] v2 --o bind5 bind5 --as--o v5 v5 --"schema:isPartOf"--> c5 bind7[/"count(?item)"/] v3 --o bind7 bind7 --as--o v5