A string caption describing the media. This can contain a field name enclosed in {}, such as {IMAGECAPTION}.
A string title for the media. This can contain a field name enclosed in {}, such as {IMAGETITLE}.
A string defining the type of media. This can be one of the following: image | barchart | columnchart | linechart | piechart
The value object contains information for pop-up windows about how images should be retrieved or charts constructed.
Defines an image or a chart to be displayed in a pop-up window.
Part of the Esri web map specification. See http://resources.arcgis.com/en/help/arcgis-web-map-json/.