{
	"version": 2,
	"data": [
		{
			"name": "pageviews",
			"values": [],
			"transform": [
				{
					"type": "formula",
					"field": "date",
					"expr": "datetime(parseInt(substring(datum.timestamp,0,4)),parseInt(substring(datum.timestamp,4,6))-1,parseInt(substring(datum.timestamp,6,8)))"
				}
			]
		},
		{
			"name": "alldata",
			"source": "pageviews",
			"transform": [
				{
					"type": "formula",
					"field": "Page views",
					"expr": "datum.views"
				},
				{ "type": "fold", "fields": [ "Page views" ] }
			]
		},
		{
			"name": "stats",
			"source": "alldata",
			"transform": [
				{
					"type": "aggregate",
					"groupby": [ "date" ],
					"summarize": [ { "field": "value", "ops": [ "sum" ] } ]
				}
			]
		}
	],
	"scales": [
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			"name": "x",
			"type": "time",
			"range": "width",
			"domain": { "data": "alldata", "field": "date" }
		},
		{
			"name": "y",
			"type": "linear",
			"range": "height",
			"nice": true,
			"domain": { "data": "stats", "field": "sum_value" }
		},
		{
			"name": "c",
			"type": "ordinal",
			"range": [ "#5DA5DA" ],
			"domain": { "data": "alldata", "field": "key" }
		}
	],
	"axes": [
		{ "type": "x", "scale": "x", "ticks": 5 },
		{ "type": "y", "scale": "y" }
	],
	"marks": [
		{
			"type": "group",
			"from": {
				"data": "alldata",
				"transform": [
					{ "type": "stack", "groupby": [ "date" ], "sortby": [ "key" ], "field": "value" },
					{ "type": "facet", "groupby": [ "key" ] }
				]
			},
			"marks": [
				{
					"type": "area",
					"properties": {
						"enter": {
							"interpolate": { "value": "monotone" },
							"x": { "scale": "x", "field": "date" },
							"y": { "scale": "y", "field": "layout_start" },
							"y2": { "scale": "y", "field": "layout_end" },
							"fill": { "scale": "c", "field": "key" },
							"fillOpacity": { "value": 1 }
						}
					}
				}
			]
		}
	]
}