ØE came by on an arranged visit to talk about many things, including Cocoon/eXist, which they're planning to use for a project soon, and the idea of an annotation server, something we're also planning for the PKP project. We talked about a framework whereby the concerns would be well separated, with the document publication engine and the annotation system living on separate servers and communicating over a stateless API, and determined that most likely, you would want the annotation server to pull content from the publication server and integrate it into its own pages. We will collaborate on a schema fragment for storage and/or transmission of annotations, and on the nature of the APIs on each side.