EntityClass

EntityClass["type",name]

represents a class of entities of the specified type identified by name.

EntityClass["type",{property1value1,property2value2,…}]

represents an implicitly defined entity class object whose members have values valuei for properties propertyi.

Details

  • Possible entity types include "Country", "Movie", "Person", "Polyhedron", and many more. A list of all available entity types can be found by evaluating EntityValue[].
  • EntityClass expressions format in StandardForm using a print form of the entity name, retrieved either from a Wolfram server or from the system cache.
  • EntityClass expressions can be created by using the WolframAlpha interface.
  • The identifier "type" is a string that represents the canonical entity type associated with a specific entity.
  • The identifier name is generally a string, but for certain entity types can also contain lists and integers.
  • 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}].

Examples

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Basic Examples  (4)

Use the WolframAlpha interface to discover particular entities:

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Represent all of the countries in Europe:

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Get a list of all the countries:

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Get a list of all chemicals that are alcohols:

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Get the population of all G8 countries:

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A list of available entity classes can be found with EntityClassList:

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Create an implicitly defined entity class consisting of all elements whose densities fall within a specified range:

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Explicitly list the elements:

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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:

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Scope  (4)

Possible Issues  (1)

See Also

EntityList  EntityValue  EntityClassList  CanonicalName  CommonName  EntityPropertyClass

Introduced in 2014
(10.0)
| Updated in 2015
(10.2)