Items - sgpinkus/json-schema GitHub Wiki
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Validation of an array instance always succeeds with regards to this keyword. The purpose of items is to validate an array instance's children (ie, elements), see here.
This keyword's value MUST be either an object or an array.
If it is an object, this object MUST be a valid JSON Schema.
If it is an array, elements of this array MUST be objects, and each of these objects MUST be a valid JSON Schema.