Archive (DDA) is a national data bank for researchers and students in Denmark and abroad. DDA is dedicated to the acquisition, preservation and dissemination of machine-readable data created by researchers from the social science and health science communities. The DDA needs to convert their existing metadata format into DDI 3. Additionally, the archive wants to integrate information from various metadata sources across into DDI 3. To achieve these objectives DDA began in the fall of 2008 to produce a workbench-style DDI editor architected in such a way that layers can be swapped out and replaced, e.g. backend persistence and DDI 3 id generation. The editor has an Eclipse Rich Client Platform (RCP) as the front end and a public API for developers, both licensed as open source software.