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Example of inheritance & references in the spec:

"Parent": {
	"description": "Parent schema",
	"type": "object",
	"required": ["id", "activities"],
	"properties": {
		"id": {
			"type": "integer",
			"example": 3,
			"enum": [3, 4, 5, 6, 7, 8, 9, 16],
			"nullable": false
		},
		"activities": {
			"type": "array",
			"nullable": false,
			"minimum": 1,
			"items": {
				"type": "string",
				"example": "6AA2A3B9-66BD-447C-90C8-A350F60D592B"
			}
		}
	}
},
"Child": {
	"description": "",
	"allOf": [{
		"$ref": "#/components/schemas/Parent"
	}],
	"type": "object",
	"properties": {
		"id": {
			"type": "integer",
			"enum": [3]
		},
		"activities": {
			"type": "array",
			"items": {
				"type": "string",
				"enum": [
					"value",
					"another value"
				]
			}
		}
	}
}

Example of keyword & circular references:

"properties": {
	"project_type": {
		"type": "object",
		"nullable": true,
		"oneOf": [{
			"$ref": "#/components/schemas/Category"
		}]
	}
}
....
"schemas": {
	"Category": {
		"type": "object",
		"required": ["short_name"],
		"properties": {
			"short_name": {
				"type": "string",
				"nullable": false,
				"example": "test"
			},
			"child": {
				"nullable": true,
				"allOf": [{
					"$ref": "#/components/schemas/Category"
				}]
			}
		}
	}
}

This is a pactflow feature, you probably want to put it in #CLS16AVEE