coli-conc Logo

Welcome to coli-conc

A service provided by

Verbundzentrale des GBV (VZG) Logo
Infrastructure to facilitate management and exchange of concordances between library knowledge organization systems

Cocoda Mapping Tool

Information Start

Cocoda Mapping Tool Screenshot

Cocoda Mapping Tool

Information Start

coli-conc enables interoperability between Knowledge Organization Systems (KOS) with focus on German library KOS. It provides a technical infrastructure to manage KOS and KOS mappings in order to facilitate a seamless access and use. This service provided by the VZG offers open source web-based applications that include:

The current focus is on library classifications Dewey Decimal Classification (DDC), Regensburg Classification (RVK), and Basisklassifikation (BK) to build complete concordances for German libraries. The infrastructure can also be used for other systems such as Wikidata and GND.



Der Abschlussbericht der letzten Entwicklungsphase des Projekts coli-conc ist von der DFG genehmigt und nun veröffentlicht worden.


Introduces tagging mismatch reasons and non-indexing concepts


Improves display of concept information, and many other small changes


Adds support for new filters, suggestions via catalog co-occurrences, and additional vocabulary APIs


Sacherschließungsdaten des K10plus-Katalog als Open Data veröffentlicht


The software library cocoda-sdk can be used to access terminologies from various sources



Freie Universität Berlin

Universität Regensburg

Leibniz-Informationszentrum Wirtschaft

Universität St.Gallen

Staatsbibliothek zu Berlin - Preußischer Kulturbesitz

Universitäts- und Landesbibliothek Tirol

gesis - Leipniz-Institut für Sozialwissenschaften

Deutsche Nationalbibliothek

Staats- und Universitätsbibliothek Hamburg

Wikimedia Deutschland


Some of the major projects in which coli-conc is involved.

Digital Assistent is a web-based tool for computer-assisted subject indexing.

An online portal for numismatics.

A method for producing multilateral mapping, storing, and using mappings among many KOS.

MAQUIS is a tool for measurement of quality and analysis of subject indexing.

CCMapper is a mapping application specialized on mapping vocabularies against the Dewey Decimal Classification (DDC).


Email for general or editorial feedback:

For technical questions or feedback, feel free to create an issue on GitHub concerning Cocoda, BARTOC, or any other software component.

Project Lead

Uma Balakrishnan

Technical Coordination

Dr. Jakob Voß

Software Development

Stefan Peters

System Librarian

Melanie Janßen