Represent a class of entities
EntityClass[type, name]
EntityClass[type, {property1 -> vspec1, property2 -> vspec2, …}]
EntityClass[cspec, psel]
EntityList[EntityClass["Chemical", "Alcohols"]]//Shallow
→ Shallow[Missing[UnknownType, Chemical]]EntityClass["MeasurementDevice", {"InstanceOf" -> ContainsAll[{Entity["MeasurementDevice", "Thermometer"]}]}]//EntityList
→ Missing[UnknownType, MeasurementDevice]EntityList[EntityClass["Planet", {"Radius" -> TakeLargest[3]}]]
→ Missing[UnknownType, Planet]