Workflows across users from different sites and document permissions, location

[mtsiak]

User A on Site A.

User B on Site B.

Workflow W: User A apply (Document A) to User B -> User B reads Document A and (a) reply (Document B) or (b) rejects the initial application. 

Architecture wise, where should document A, and document B live in Alfresco, given the restriction that each user can only view/edit documents from their site?

Thank you in advance.

(ps: we use alfresco community edition 5.0)

[afaust]

Alfresco has a concept of workflow packages which can (temporarily) be used to expose a document to workflow participants outside the scope of a site. This would need some initialisation logic in the process to copy/move the file to the bpmackage, as well as conclusion logic to move/copy it back. Also, permissions should be added on the package to ensure only the participants have access to it.