gistfile1.txt

{  	_id: ObjectId(),
    	geoCode: 1, // used to localize write operations
	sessionId: “2373BB…", // tracks activities across sessions
	device: { id: “1234", // tracks activities across different user devices
              	  type: "mobile/iphone",
                  userAgent: "Chrome/34.0.1847.131"
            	}
	type: "VIEW|CART_ADD|CART_REMOVE|ORDER|…", // type of activity
	itemId: “301671", // item that was viewed, added to cart, etc.
	sku: “730223104376", //item sku
	order: { id: “12520185", // info about orders associated with the activity
		… },
	location: [ -86.95444, 33.40178 ], //user’s location when the activity was performed
	tags: [ "smartphone", "iphone", … ], // associated tags
	timeStamp: Date("2014/04/01 …”) // time the activity was performed
}