GET this from a known URL to enumerate the workspace on a server
A workspace is a server-defined group of collections
Example from the spec:
<?xml version="1.0" encoding='utf-8'?>
<service xmlns="http://purl.org/atom/app#">
<workspace title="Main Site" >
<collection
title="My Blog Entries"
href="http://example.org/reilly/main" >
<accept>entry</accept>
</collection>
<collection
title="Pictures"
href="http://example.org/reilly/pic" >
<accept>media</accept>
</collection>
</workspace>
<workspace title="Side Bar Blog">
<collection title="Remaindered Links"
href="http://example.org/reilly/list" >
<member-type>entry</member-type>
</collection>
</workspace>
</service>
This Introspection Document describes two workspaces. The first, called 'Main Site', has two collections called 'My Blog Entries' and 'Pictures' whose IRIs are 'http://example.org/reilly/main' and 'http://example.org/reilly/pic' respectively. 'My Blog Entries' is an Entry collection and 'Pictures' is a Media collection....
The second workspace is called 'Side Bar Blog' and has a single collection called 'Remaindered Links' whose collection IRI is 'http://example.org/reilly/list'. 'Remaindered Links' is an Entry collection.
application/atomserv+xml media type