{
    "type": "object",
    "properties": {
	"features": {
	    "type": "array",
	    "items": {
		"type": "object",
		"properties": {
		    "extractor": {
			"oneOf": [
			    {
				"type": "string",
				"minLength": 1
			    },
			    {
				"type": "object",
				"properties": {
				    "name": {
					"type": "string",
					"minLength": 1
				    },
				    "parameters": {
					"type": "array",
					"default": []
				    }
				},
				"required": ["name"]
			    }
			]
		    },
		    "normalizer": {
			"type": "string",
			"minLength": 1
		    }
		},
		"required": ["extractor", "normalizer"]
	    },
	    "minLength": 1
	}
    },
    "required": ["features"]
}
{
    "type": "object",
    "properties": {
	"features": {
	    "type": "array",
	    "items": {
		"type": "object",
		"properties": {
		    "extractor": {
			"oneOf": [
			    {
				"type": "string",
				"minLength": 1
			    },
			    {
				"type": "object",
				"properties": {
				    "name": {
					"type": "string",
					"minLength": 1
				    },
				    "parameters": {
					"type": "array",
					"default": []
				    }
				},
				"required": ["name"]
			    }
			]
		    },
		    "normalizer": {
			"type": "string",
			"minLength": 1
		    }
		},
		"required": ["extractor", "normalizer"]
	    },
	    "minItems": 1
	}
    },
    "required": ["features"]
}

Fix typo (minLength -> minItems)
Fix typo (minLength -> minItems)
