To add this widget to your Enketo Express installation see this guidance.

Works on SVG media if the following is present for a question in XLSForm (or XForm):

1. Appearance "image-customization" on select_one and select_multiple questions.
2. The column "body::kb:image-customization" is present with a ${style} reference for that question.
3. The settings sheet has a namespaces setting containing kb="http://kobotoolbox.org/xforms".
4. The ${style} calculation produces a stringified JSON format with SVG style instructions. The special "selected" property is optional and can be used to override the selected style in the image-map widget (in case both are combined). The other properties correspond to an id attribute on a <path> in the SVG. Multiple style properties can be customized. See example:

{
	"selected": {
		"stroke": "yellow",
		"stroke-width": 4
	},
	"AL": {
		"fill": "#ccc"
	},
	"CO": {
		"fill": "#ababab"
	}
}

Note that this widget is a custom hack for which we cannot device a proper sane XForm syntax. It is therefore not suitable for inclusion in the common Enketo tools and the ODK XForms specification.