query: embed.html##display instance of class of ambassadors to/of a country 
  SELECT DISTINCT ?item ?itemLabel ?subclass ?subclassLabel
  WHERE
  {
      {?item wdt:P279 wd:Q29645880.} union {?item wdt:P279 wd:Q29645886}
      ?item wdt:P279 ?subclass.
      SERVICE wikibase:label { bd:serviceParam wikibase:language "AUTO LANGUAGE,en" }
  }