Duplicated mapping key problem

[bopritchard]

How can I express the following in a definition without getting the duplicated mapping key error

{
	"encounter": [{
			"url": "TotalVisits",
			"valueString": "10"
		},
		{
			"url": "Notes",
			"valueString": "Authorization notes go here."
		}
	]
}

[RonRatovsky]

What have you tried that got you an error?