As an Adobe Photoshop user, I can manage links in my document

similar to current support in indesign. Photoshop:
As a user, I can create PS files with local content and then save the AI file and local files to the Nuxeo repository.

As a user, I can create PS files with content stored in the Nuxeo repository.

As a user, I can edit PS files stored in the Nuxeo repository.

As a user, I know that files have been placed in PS files via the file's metadata. (compound docs)

As a user, I know the location of the placed file (layer or artboard location).

As a user, I am notified when a linked object is modified in the repository.