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MIXED is delivering results of various kinds: software and its documentation, an XML schema, a user interface, etc. This is the top of the section where we point at these results.

Table of Contents

User Interfaces


Standard Data Formats for Preservation



User Interfaces

Web console

MIXED can be used by interested users through a web console. This interface admits conversion of individual files. It is meant for those who want to investigate the capabilities of MIXED without setting up a local MIXED and without talking to MIXED through a web service. Here is an outdated manual. An updated manual for this interface will be published at the web console itself. We do not yet guarantee an uninterrupted service. Sometimes the web console may fail without notice. We aim at a robust service from spetember 2009 onwards.

Web service

To be specified.

Command line tool

The command line tool needs a local installation of the MIXED framework. A manual will be published here.


All MIXED software will be published on an Open Source software repository. We are currently experimenting what the best repository is.

The MIXED software consists of a generic framework plus individual conversion plugins. A conversion plugin is a self-contained package that implements the conversion of a data format to SDFP or vice versa, but not both. A plugin can be installed, activated and deinstalled on a running MIXED framework, without the need to restart the framework. The framework can orchestrate concurrent conversion requests to the appropriate conversion plugins.


The software of the MIXED framework is not yet published.

We have an initial architecture document and a first software review by SCCH. There will be an updated architecture document and a second review later this year.


We have published the current version of our DBF libraries at SourceForge. The DBF libraries read and write the various formats of the dBase database.

Standard Data Formats for Preservation

MIXED refers to an XML schema called SDFP that (partly) specifies its intermediate XML format. All MIXED conversion plugins either convert from a real-world format to SDFP, or from SDFP to a real-world format, but not both. The XML schema can be referenced by [to be specified] and downloaded.

There is also documentation. An important part of the documentation is an account of the elementary datatypes such as numbers and dates. We have studied the ISO 8601 for date and time representations, and ISO 6093 for number representations. The MIXED conversions that read SDFP will accept representations for dates, times and numbers according to these standards. The MIXED conversions that write SDFP will write representations according to these standards, but in this case not all representations that the standards allow will be produced. MIXED is stricter, because it does not use representations that rely in some way in the context. Here are the details: dates and times and numeric representations. Later on we integrate these documents with the SDFP documentation.

Statistical data is a form of tabular data that is not in the scope of MIXED. But MIXED is already prepared to deal with it. In SDFP we use DDI2 as a sub schema to deal with statistical data. In a position paper we explain why we use DDI's version 2 and not (yet) 3.


We plan an expert meeting in summer/autumn 2009, to discuss digital preservation tools, the infrastructure involved digital preservation, research data archives and outreach of Open Source software. The purpose is to develop scenarios that make the MIXED results really useful to archives and the wider world of digital preservation.


MIXED will be used in the DANS archive. This implementation will be a reference implementation of MIXED for archives. Here we collect the use cases that are typical for an archive, and we report on problems, solutions, experiences.

One of the first useful things is to have an overview of the file formats that exist in the archive. Here is the DANS inventory of file formats.