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EntityClass

EntityClass[type,name] represents a class of entities of the specified type identified by name.

EntityClass[type,{property1->vspec1,property2->vspec2,…}] 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.

Please visit the official Wolfram Language Reference for more details and examples on core symbols.