Defining Types: Using allOf in Swagger JSON

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AllOf is an array of object definitions that are used for independent validation but together compose a single object. The data provided by the client must be valid against all of the given subschemas - source: Devanath from Pixabay. The allOf keyword is used to extend an already defined type 'AnyArticleSchema', by adding one more property 'articleRank' to it. You may use these in scenarios where you don't want to repeat the whole Schema and existing Schema is already being used in many places.