EntityClass
Listing of Entity Types »EntityClass["type",name]
represents a class of entities of the specified type identified by name.
EntityClass["type",{property1vspec1,property2vspec2,…}]
represents an implicitly defined entity class containing entities of the specified type for which the properties propertyi conform to the value selector vspeci.
EntityClass[cspec,psel]
represents an entity class with members specified by cspec, selected by the property selector psel.
Details
- Built-in Entity objects can be specified with natural language using
. - In Entity["type",name], the type can be either a built-in entity type or a type specified in an EntityStore registered with EntityRegister.
- Implicitly defined entity classes can be resolved into canonically named entities using EntityList[EntityClass["type",{property1value1,property2value2,…}]].
- An implicitly defined entity class represents all entities that fulfill all the specified restrictions on property values.
- Property values in implicitly defined entity classes may make use of Quantity (and intervals of Quantity) for dimensional values, Between for numeric values, DateObject for dates, TakeLargest and TakeSmallest for ordinal selections, and ContainsAll, ContainsExactly, ContainsAny, ContainsOnly, ContainsNone for entities. Lists of entities are interpreted as ContainsAll, while a single entity is interpreted as ContainsAny[{entity}].
- Information of an EntityClass expression will give different properties depending on the EntityTypeName associated with the expression.
Examples
open all close allBasic Examples (4)
Use the 
WolframAlpha interface to discover particular entities:
Represent all of the countries in Europe:
Get a list of all the countries:
Get a list of all chemicals that are alcohols:
Get the population of all G7 countries:
A list of available entity classes can be found with EntityClassList:
Create an implicitly defined entity class consisting of all elements whose densities fall within a specified range:
Use an implicitly defined entity class to select the countries with the world's 10 longest borders and return them together with their corresponding border lengths:
