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.



Performance improvements and many bug fixes


Cocoda 1.4.8 improves scrolling performance and includes bug fixes.


Cocoda 1.4.7 adds support of more English vocabularies such as MeSH and LCSH


Wir suchen zum nächstmöglichen Zeitpunkt Verstärkung für unser Team


coli-ana integration


We present an API and web interface to look up which DDC classes are contained in a synthesized DDC number



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.

A database of Knowledge Organization Systems and KOS related registries.

A tool for analysis of synthesized DDC numbers.

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).




Project Lead

Uma Balakrishnan

Technical Coordination

Dr. Jakob Voß

Software Development

Stefan Peters