One of the things we are working on for an upcoming release is REST interfaces into all our content. If you aren't familiar with REST I'd just suggest reading Building Web Services the REST Way.
Today, within the Zimbra Collaboration Suite we have a number of different server-side URLs that our client accesses to download an attachment, export contacts as CSV, export a calendar as an ICS, file etc. We are also adding sharing (what would collaboration be without sharing, after all) of calendars, contacts, etc. Not only within a particular Zimbra community, but between Zimbra communities and the public at large.
In order to facilitate this, we are coming up with a clean, consistent URL interface to all our resources. The best way to describe this is with some examples.
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