Domain is the opposite of Path.

Group checks the services in sx, it looks for a Group attribute on the shortest keys.

Path converts a domainname to an etcd path.

PathWithWildcard ascts as Path, but if a name contains wildcards (* or any), the name will be chopped of before the (first) wildcard, and we do a highler evel search and later find the matching names.

Service defines a discoverable service in etcd.