In 1895, they created the Universal Bibliographic Repertory (Répertoire Bibliographique Universel) (RBU) which was intended to become a comprehensive classified index to all published information.
This class was freed by moving linguistics into class 8 in the 1960s to make space for future developments in the rapidly expanding fields of knowledge; primarily natural sciences and technology. ==== Common auxiliary tables ==== Common auxiliaries are aspect-free concepts that can be used in combination with any other UDC code from the main classes or with other common auxiliaries.
Since 1991, the UDC has been owned and managed by the UDC Consortium, a non-profit international association of publishers with headquarters in The Hague (Netherlands). Unlike other library classification schemes that have started their life as national systems, the UDC was conceived and maintained as an international scheme.
Since 1993, a standard version of UDC has been maintained and distributed in a database format: UDC Master Reference File (UDC MRF) which is updated and released regularly.
The complete special auxiliary tables contain around 2000 subdivisions of various attributes that can be attached to express various aspects of individual faiths to a great level of specificity allowing equal level of detail for every religion. 2-1/-9 Special auxiliary subdivision for religion 2-1 Theory and philosophy of religion.
088) released by the UDC Consortium under the Creative Commons Attribution Share Alike 3.0 license (first release 2009, subsequent update 2012). === Main tables === ====0 Science and knowledge.
The 2011 version of the MRF (released in 2012) contains over 70,000 classes.
The 2011 version of the MRF (released in 2012) contains over 70,000 classes.
088) released by the UDC Consortium under the Creative Commons Attribution Share Alike 3.0 license (first release 2009, subsequent update 2012). === Main tables === ====0 Science and knowledge.
The catalogue and its content organized by UDC can still be seen in Mundaneum in Mons, Belgium (in 2013 recommended for inclusion in the UNESCO Memory of the World Register). == The application of UDC == UDC is used in around 150,000 libraries in 130 countries and in many bibliographical services which require detailed content indexing.
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