LinkBack
LinkBack, from Nisus, Omni, and Blacksmith, brings EGO-like functionality, like that found in the old Nisus Writer, to Mac OS X:
LinkBack is an open source framework for Mac OS X that helps developers integrate content from other applications into their own. A user can paste content from any LinkBack-enabled application into another and reopen that content later for editing with just a double-click. Changes will automatically appear in the original document again when you save.
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It's not OpenDoc, it's OLE, but with a sane API.
The goals of the LinkBack framework are:
�To enable applications to share data with one another, maintaining a link to the originating
application so that the user can edit the data or have it refreshed.
�To provide this functionality though a simple API that is simple to use and requires minimal
changes in an existing Cocoa-based application.
The goal of LinkBack is not to provide for in-application editing of data from another app. For
example, LinkBack does not provide for a graphics application to provide an in-application
editor for a word processor.
Actually, it might be a most like NeXT's object linking technology which was in NeXTSTEP 3.0, but wasn't maintained into OpenSTEP.
This page might be useful - Object Links release note from 3.3:
http://www.channelu.com/NeXT/NeXTStep/3.3/nd/ReleaseNotes/ObjectLinks.htmld/
