It should be possible to manage bookmarks through REST API.

Bookmarks resource collection would be exposed from within the API entry point:

# GET /ovirt-engine/api
<api>
  ...
  <link href="/ovirt-engine/api/bookmarks" rel="bookmarks"/>
  ...
</api>

# GET /ovirt-engine/api/bookmarks
<bookmarks>
  <bookmark href="/ovirt-engine/api/bookmarks/{id}" id="{id}">
    <name>test</name>
    ...
  </bookmark>
</bookmarks>

Default REST method semantics apply:
  # POST /ovirt-engine/api/bookmarks - add bookmark
  # PUT /ovirt-engine/api/bookmarks/{id} - update bookmark
  # DELETE /ovirt-engine/api/bookmarks/{id} - remove bookmark