query: embed.html#SELECT *
  WITH
  { SELECT ("qualifier" as ?type)         (MIN(?q) as ?min)  (MAX(?q) as ?max)    WHERE  { [] pq:P2135 ?q } } as %pq
  WITH
  { SELECT ("statement value" as ?type)   (MIN(?q) as ?min)  (MAX(?q) as ?max)    WHERE  { [] wdt:P2135 ?q } } as %wdt
  WHERE
  {
    { INCLUDE %pq } UNION { INCLUDE %wdt }
  }