Exploring further Web Map Service output formats
The OpenLayers format is a special case. Indeed, when you ask for it, GeoServer is not answering with a single object, but with a full web application. As you learned, the application then issues other WMS requests to get a representation of the map.
In the following sections, we will discover what formats you can use and which are best suited for your applications.
The AtomPub format
The Atom Publishing Protocol (AtomPub) format is a XML-based output. Also known as a Vector output type, it is comparable to RSS feeds, which are more common. It allows others to subscribe to features published by GeoServer. The output format is specified by application/atom+xml as the format parameter value.
The GIF format
The Graphics Interchange Format (GIF) output format is well-known. It has been around for a long time on the Web. This format only supports 256 colors, so it is rarely used for high-quality images. In some cases, it is useful when simple shape...
