(in which all the subjects envisaged are already listed and coded) into one which allows for synthesis (that is, the construction of compound numbers to denote interrelated subjects that could never be exhaustively foreseen); various possible relations between subjects were identified, and symbols assigned to represent them. In its first edition in French "Manuel du Répertoire bibliographique universel" (1905), the UDC already included many features that were revolutionary in the context of knowledge classifications: tables of generally applicable (aspect-free) concepts—called common auxiliary tables; a series of special auxiliary tables with specific but re-usable attributes in a particular field of knowledge; an expressive notational system with connecting symbols and syntax rules to enable coordination of subjects and the creation of a documentation language proper. The Universal Bibliographic Repertory itself has developed into a remarkable information resource. In the period before World War I it grew to more than eleven million records. 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. In a number of countries it is the main classification system for information exchange and is used in all types of libraries: public, school, academic and special libraries. UDC is also used in national bibliographies of around 30 countries. Examples of large databases indexed by UDC include: NEBIS (The Network of Libraries and Information Centers in Switzerland) — 2.6 million records COBIB.SI (Slovenian National Union Catalogue) — 3.5 million records Hungarian National Union Catalogue (MOKKA) — 2.9 million records VINITI RAS database (All-Russian Scientific and Technical Information Institute of Russian Academy of Science) with 28 million records Meteorological & Geoastrophysical Abstracts (MGA) with 600 journal titles PORBASE (Portuguese National Bibliography) with 1.5 million records UDC has traditionally been used for the indexing of scientific articles which was an important source of information of scientific output in the period predating electronic publishing. Collections of research articles in many countries covering decades of scientific output contain UDC codes. Examples of journal articles indexed by UDC: UDC code 663.12:57.06 in the article "Yeast Systematics: from Phenotype to Genotype" in the journal Food Technology and Biotechnology () UDC code 37.037:796.56, provided in the article "The game method as means of