How many {protocol} are to/by {Internet Protocol version 6} ?
Which is the number of protocols that Internet Protocol version 6 has?
How many protocols does "Internet Protocol version 6" have?
SELECT ( COUNT ( ?i ) AS ?d ) { ?i property:protocol resource:IPv6 }
SELECT (COUNT(?sub) AS ?subs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?sub .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2700> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q2551624 .
} 

SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P2700 wd:Q2551624 }
6