The Saxon State and University Library Dresden (SLUB) has built up its digital preservation system SLUBArchiv from 2012 to 2014. In January 2015, we launched the preservation workflow for digitized documents. This workflow extends the in-house mass digitization workflow, which is based on the software Kitodo.Production. In this paper, we describe the three major challenges we faced while extending our mass digitization workflow with an automatic preparation and ingest into our digital long-term preservation system and the solutions we found. These challenges have been
(1) validating and checking not only the target file format of the scanning process but also the constraints to it,
(2) handling updates of digital documents that have already been submitted to the digital long-term preservation system, and
(3) checking the integrity of the archived data as a whole in a comprehensive but affordable fashion.

This paper describes the interoperability solutions which have been developed in the context of the E-ARK project. The project has, since February 2014, tackled the need for more interoperability and collaboration between preservation organizations. The solutions being developed include harmonized specifications for Submission, Archival and Dissemination Information Packages; and pre-ingest and access workflows. Furthermore, the specifications have been implemented using a range of software tools and piloted in real-life scenarios in various European archival institutions.
This paper provides a statement on the need for interoperability, and an overview of the necessary specifications and tools, and it calls for preservation organizations to continue collaboration beyond the lifetime of the E-ARK project.