Per RFC 5023:
The root of a Service Document is the "app:service" element.
The app:service element is the container for service information
associated with one or more Workspaces. An app:service element MUST
contain one or more app:workspace elements.
namespace app = "http://www.w3.org/2007/app"
start = appService
appService =
element app:service {
appCommonAttributes,
( appWorkspace+
& extensionElement* )
}
For authoring to commence, a client needs to discover the
capabilities and locations of the available Collections. Service
Documents are designed to support this discovery process.
How Service Documents are discovered is not defined in this
specification.
Service Documents are identified with the "application/atomsvc+xml"
media type