Integration with Document Management Systems

I understand Tryton currently has support for attachments

Has anybody explored or implemented integration with any Document Management System?

In other words, importing an attachment directly from the DMS to Tryton or creating a link from a Tryton record to a document?

We did such thing to save some documents (invoices, …) (when printing) directly in our DMS (www.alfresco.org).

With mayan edms, ingress via e-Mail (that can be generated via Trigger) is easy. What I couldn’t find out yet: there seems to be no possibility to set the edms ingress E-Mail address in the trigger.