A group of attributes describing the structure of entities is called what?

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In database modeling, an entity type is a class of objects that share the same attributes. The attributes define the properties every member of that class has, so the collection of those attributes describes the structure of that group. That’s why the best term is entity-type. The other terms don’t fit common modeling language: attribute-type isn’t used to name a class of entities, relation-type refers more to a table or association, and schema-type isn’t standard terminology—the overall blueprint is called a schema.