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Universal Decimal Classification
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<h2 id="history">History</h2> <p>The UDC was developed by the <a href="/facts/Belgium/YKuMXP5j">Belgian</a> bibliographers <a href="/facts/Paul_Otlet/JqdSmC7w">Paul Otlet</a> and <a href="/facts/Henri_La_Fontaine/NSVICMVI">Henri La Fontaine</a> at the end of the 19th century. In 1895, they created the Universal Bibliographic Repertory (<i>Répertoire Bibliographique Universel</i>) (RBU) which was intended to become a comprehensive classified index to all published information. The idea that the RBU should take the form of a card catalogue came from the young American zoologist <a href="/facts/Herbert_Haviland_Field/c259gN7m">Herbert Haviland Field</a>, who was at the time himself setting up a bibliographical agency in Zurich, the <a href="/facts/Concilium_Bibliographicum/dnbnVcw0">Concilium Bibliographicum</a>.<a class="footnote-ref" id="fnref:15" href="#fn:15"><sup>15</sup></a> A means of arranging the entries would be needed, and Otlet, having heard of the <a href="/facts/Dewey_Decimal_Classification/BsT2QEP2">Dewey Decimal Classification</a>, wrote to Melvil Dewey and obtained permission to translate it into French. The idea outgrew the plan of mere translation, and a number of radical innovations were made, adapting the purely enumerative classification (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 "<i>Manuel du Répertoire bibliographique universel</i>" (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. </p><p>The Universal Bibliographic Repertory grew to more than eleven million records in the period before <a href="/facts/World_War_I/vITTUanQ">World War I</a>. The catalogue and its content organized by UDC can still be seen in <a href="/facts/Mundaneum/CItLRRD3">Mundaneum</a> in Mons, Belgium. In 2013 this catalogue was accepted onto the UNESCO <a href="/facts/Memory_of_the_World_Programme/Ce0jV0Bh">Memory of the World international register</a>, recognising it as documentary heritage of global importance.<a class="footnote-ref" id="fnref:16" href="#fn:16"><sup>16</sup></a> </p> <h2 id="the-application-of-udc">The application of UDC</h2> <p>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.<a class="footnote-ref" id="fnref:17" href="#fn:17"><sup>17</sup></a><a class="footnote-ref" id="fnref:18" href="#fn:18"><sup>18</sup></a><a class="footnote-ref" id="fnref:19" href="#fn:19"><sup>19</sup></a> </p><p>UDC is also used in <a href="/facts/National_bibliographies/ffQh65ft">national bibliographies</a> of around 30 countries. Examples of large databases indexed by UDC include:<a class="footnote-ref" id="fnref:20" href="#fn:20"><sup>20</sup></a> </p> 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 <a href="/facts/VINITI_RAS/l1jHhfhT">VINITI RAS</a> 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 <p>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: </p> UDC code 663.12:57.06 in the article "Yeast Systematics: from Phenotype to Genotype" in the journal <i>Food Technology and Biotechnology</i> (<a href="/facts/ISSN_(identifier)/DPAflDvU">ISSN</a> <a href="https://www.worldcat.org/search?fq=x0:jrnl&q=n2:1330-9862">1330-9862</a>)<a class="footnote-ref" id="fnref:21" href="#fn:21"><sup>21</sup></a> UDC code 37.037:796.56, provided in the article "The game method as means of interface of technical-tactical and psychological preparation in sports orienteering" in the Russian journal "<i>Pedagogico-psychological and medico-biological problems of the physical culture and sport</i>" (<a href="/facts/ISSN_(identifier)/DPAflDvU">ISSN</a> <a href="https://www.worldcat.org/search?fq=x0:jrnl&q=n2:2070-4798">2070-4798</a>).<a class="footnote-ref" id="fnref:22" href="#fn:22"><sup>22</sup></a> UDC code 621.715:621.924:539.3 in the article Residual Stress in Shot-Peened Sheets of AIMg4.5Mn Alloy - in the journal <i>Materials and technology</i> (<a href="/facts/ISSN_(identifier)/DPAflDvU">ISSN</a> <a href="https://www.worldcat.org/search?fq=x0:jrnl&q=n2:1580-2949">1580-2949</a>).<a class="footnote-ref" id="fnref:23" href="#fn:23"><sup>23</sup></a> <p>The design of UDC lends itself to machine readability, and the system has been used both with early automatic mechanical sorting devices, and modern library <a href="/facts/OPAC/6lR6JxQW">OPACs</a>.<a class="footnote-ref" id="fnref:24" href="#fn:24"><sup>24</sup></a><a class="footnote-ref" id="fnref:25" href="#fn:25"><sup>25</sup></a> Since 1993, a standard version of UDC has been maintained and distributed in a <a href="/facts/Database/VYcpkevb">database</a> format: UDC Master Reference File (UDC MRF) which is updated and released regularly.<a class="footnote-ref" id="fnref:26" href="#fn:26"><sup>26</sup></a> The 2011 version of the MRF (released in 2012) contains over 70,000 classes.<a class="footnote-ref" id="fnref:27" href="#fn:27"><sup>27</sup></a> In the past full printed editions used to have around 220,000 subdivisions.<a class="footnote-ref" id="fnref:28" href="#fn:28"><sup>28</sup></a> </p> <h2 id="udc-structure">UDC structure</h2> <h3>Notation</h3> <p>A notation is a code commonly used in classification schemes to represent a class, i.e. a subject and its position in the hierarchy, to enable mechanical sorting and filing of subjects. UDC uses <a href="/facts/Arabic_numerals/LryNhh26">Arabic numerals</a> arranged decimally. Every number is thought of as a decimal fraction with the initial decimal point omitted, which determines the filing order. An advantage of decimal notational systems is that they are infinitely extensible, and when new subdivisions are introduced, they need not disturb the existing allocation of numbers. For ease of reading, a UDC notation is usually punctuated after every third digit: </p> <table><tbody><tr><td>Notation</td><td>Caption (Class description)</td></tr><tr><td>539.120</td><td>Theoretical problems of elementary particles physics. Theories and models of fundamental interactions</td></tr><tr><td>539.120.2</td><td>Symmetries of quantum physics</td></tr><tr><td>539.120.22</td><td>Conservation laws</td></tr><tr><td>539.120.222</td><td>Translations. Rotations</td></tr><tr><td>539.120.224</td><td>Reflection in time and space</td></tr><tr><td>539.120.226</td><td>Space-time symmetries</td></tr><tr><td>539.120.23</td><td>Internal symmetries</td></tr><tr><td>539.120.3</td><td>Currents</td></tr><tr><td>539.120.4</td><td>Unified field theories</td></tr><tr><td>539.120.5</td><td>Strings</td></tr></tbody></table> <p>In UDC the notation has two features that make the scheme easier to browse and work with: </p> <ul><li>hierarchically expressive – the longer the notation, the more specific the class: removing the final digit automatically produces a broader class code.</li> <li>syntactically expressive – when UDC codes are combined, the sequence of digits is interrupted by a precise type of punctuation sign which indicates that the expression is a combination of classes rather than a simple class e.g. the colon in 34:32 indicates that there are two distinct notational elements: 34 Law. Jurisprudence and 32 Politics; the closing and opening parentheses and double quotes in the following code 913(574.22)"19"(084.3) indicate four separate notational elements: 913 Regional geography, (574.22) North Kazakhstan (Soltüstik Qazaqstan); "19" 20th century and (084.3) Maps (document form)</li></ul> <h3>Basic features and syntax</h3> <p>UDC is an analytico-synthetic and <a href="/facts/Faceted_classification/4jNTPVMC">faceted classification</a>. It allows an unlimited combination of attributes of a subject and relationships between subjects to be expressed. UDC codes from different tables can be combined to present various aspects of document content and form, e.g. 94(410)"19"(075) History <i>(main subject)</i> of United Kingdom <i>(place)</i> in 20th century <i>(time)</i>, a textbook <i>(document form)</i>. Or: 37:2 Relationship between Education and Religion. Complex UDC expressions can be accurately parsed into constituent elements. </p><p>UDC is also a disciplinary classification covering the entire universe of knowledge.<a class="footnote-ref" id="fnref:29" href="#fn:29"><sup>29</sup></a> This type of classification can also be described as <i>aspect</i> or <i>perspective</i>, which means that concepts are subsumed and placed under the field in which they are studied. Thus, the same concept can appear in different fields of knowledge. This particular feature is usually implemented in UDC by re-using the same concept in various combinations with the main subject, e.g. a code for language in common auxiliaries of language is used to derive numbers for ethnic grouping, individual languages in linguistics and individual literatures. Or, a code from the auxiliaries of place, e.g. <i>(410) United Kingdom</i>, uniquely representing the concept of United Kingdom can be used to express <i>911(410) Regional geography of United Kingdom</i> and <i>94(410) History of United Kingdom</i>. </p> <h3>Organization of classes</h3> <p>Concepts are organized in two kinds of tables in UDC:<a class="footnote-ref" id="fnref:30" href="#fn:30"><sup>30</sup></a> </p> <ul><li>Common auxiliary tables (including certain auxiliary signs). These tables contain facets of concepts representing general recurrent characteristics, applicable over a range of subjects throughout the main tables, including notions such as place, language of the text and physical form of the document, which may occur in almost any subject. UDC numbers from these tables, called common auxiliaries are simply added at the end of the number for the subject taken from the main tables. There are over 15,000 common auxiliaries in UDC.</li> <li>The main tables or main schedules containing the various disciplines and branches of knowledge are arranged in 9 main classes, numbered from 0 to 9 (with class 4 being vacant). At the beginning of each class there are also series of special auxiliaries, which express aspects that are recurrent within this specific class. Main tables in UDC contain more than 60,000 subdivisions.</li></ul> <h4>Main classes</h4> <ul><li>0 <a href="/facts/Science/IJoaD7rs">Science</a> and <a href="/facts/Knowledge/joozoaup">Knowledge</a>. <a href="/facts/Organization/CR83f1Rn">Organization</a>. <a href="/facts/Computer_Science/lN3pEyPz">Computer Science</a>. <a href="/facts/Information_Science/HGG3e3Jv">Information Science</a>. <a href="/facts/Documentation/IdrD9jer">Documentation</a>. <a href="/facts/Librarianship/AHbDQG5d">Librarianship</a>. <a href="/facts/Institutions/kGkhGcMN">Institutions</a>. <a href="/facts/Publications/C85p7aCC">Publications</a></li> <li>1 <a href="/facts/Outline_of_philosophy/rVGFT3l6">Philosophy</a>. <a href="/facts/Outline_of_psychology/HlSs5Uap">Psychology</a></li> <li>2 <a href="/facts/Outline_of_religion/PoMdH0Ek">Religion</a>. <a href="/facts/Outline_of_theology/appM4KvI">Theology</a></li> <li>3 <a href="/facts/Outline_of_social_science/27U5qdFK">Social Sciences</a></li> <li>4 <i>vacant</i></li> <li>5 <a href="/facts/Outline_of_mathematics/bzYALmb2">Mathematics</a>. <a href="/facts/Outline_of_natural_science/4DM0XSMN">Natural Sciences</a></li> <li>6 <a href="/facts/Outline_of_applied_science/JsDaEAWL">Applied Sciences</a>. <a href="/facts/Outline_of_medicine/fD6szUV5">Medicine</a>, <a href="/facts/Outline_of_technology/Xxm2VHux">Technology</a></li> <li>7 <a href="/facts/The_arts/kabJ6XX6">The Arts</a>. <a href="/facts/Outline_of_entertainment/1LdSoosY">Entertainment</a>. <a href="/facts/Outline_of_sports/QnhomqhE">Sport</a></li> <li>8 <a href="/facts/Outline_of_linguistics/kJ601X2e">Linguistics</a>. <a href="/facts/Outline_of_literature/xnye0Amb">Literature</a></li> <li>9 <a href="/facts/Outline_of_geography/NuJyWqhU">Geography</a>. <a href="/facts/Outline_of_history/tlejX1DQ">History</a></li></ul> <p>The vacant class 4 is the result of a planned schedule expansion. 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. </p> <h4>Common auxiliary tables</h4> <p><i>Common auxiliaries</i> are aspect-free concepts that can be used in combination with any other UDC code from the main classes or with other common auxiliaries. They have unique notational representations that make them stand out in complex expressions. Common auxiliary numbers always begin with a certain symbol known as a facet indicator, e.g. = (equal sign) always introduces concepts representing the language of a document; (0...) numbers enclosed in parentheses starting with zero always represent a concept designating document form. Thus (075) Textbook and =111 English can be combined to express, e.g.(075)=111 Textbooks in English, and when combined with numbers from the main UDC tables they can be used as follows: 2(075)=111 Religion textbooks in English, 51(075)=111 Mathematics textbooks in English etc. </p> <ul><li>=... Common auxiliaries of language. Table 1c</li> <li>(0...) Common auxiliaries of form. Table 1d</li> <li>(1/9) Common auxiliaries of place. Table 1e</li> <li>(=...) Common auxiliaries of human ancestry, ethnic grouping and nationality. Table 1f</li> <li>"..." Common auxiliaries of time. Table 1g helps to make minute division of time e.g.: "1993-1996"</li> <li>-0... Common auxiliaries of general characteristics: Properties, Materials, Relations/Processes and Persons. Table 1k.</li> <li>-02 Common auxiliaries of properties. Table 1k</li> <li>-03 Common auxiliaries of materials. Table 1k</li> <li>-04 Common auxiliaries of relations, processes and operations. Table 1k</li> <li>-05 Common auxiliaries of persons and personal characteristics. Table 1k this table is repeated</li></ul> <h4>Connecting signs</h4> <p>In order to preserve the precise meaning and enable accurate parsing of complex UDC expressions, a number of connecting symbols are made available to relate and extend UDC numbers. These are: </p> <table><tbody><tr><th>Symbol</th><th>Symbol name</th><th>Meaning</th><th>Example</th></tr><tr><td>+</td><td><a href="/facts/Plus_and_minus_signs/6RJD4Xt9">plus</a></td><td>coordination, addition</td><td>e.g. 59+636 <a href="/facts/Zoology/6Kj13mBt">zoology</a> and <a href="/facts/Animal_breeding/a9VgVI2I">animal breeding</a></td></tr><tr><td>/</td><td><a href="/facts/Slash_(punctuation)/fuaRyKzc">stroke</a></td><td>consecutive extension</td><td>e.g. 592/599 Systematic zoology (everything from 592 to 599 inclusive)</td></tr><tr><td>:</td><td><a href="/facts/Colon_(punctuation)/se9fjJa4">colon</a></td><td>relation</td><td>e.g. 17:7 Relation of <a href="/facts/Ethics/wNVNgL5q">ethics</a> to <a href="/facts/Art/ILbnQHHb">art</a></td></tr><tr><td>[ ]</td><td>square <a href="/facts/Bracket/yzGM9J8A">brackets</a></td><td>subgrouping</td><td>e.g. 311:[622+669](485) <a href="/facts/Statistics/DNPsKGYU">statistics</a> of <a href="/facts/Mining/g6uDIFab">mining</a> and <a href="/facts/Metallurgy/1SANyxX4">metallurgy</a> in <a href="/facts/Sweden/u3qC7lyj">Sweden</a> (the auxiliary qualifiers 622+669 considered as a unit)</td></tr><tr><td>*</td><td>asterisk</td><td>Introduces non-UDC notation</td><td>e.g. 523.4*433 Planetology, minor planet Eros (<a href="/facts/International_Astronomical_Union/GMFPImXo">IAU</a> authorized number after the asterisk)</td></tr><tr><td>A/Z</td><td>alphabetical extension</td><td>Direct alphabetical specification</td><td>e.g. 821.133.1MOL French literature, works of Molière</td></tr></tbody></table> <h2 id="udc-outline">UDC outline</h2> <p>UDC classes in this outline are taken from the Multilingual Universal Decimal Classification Summary (UDCC Publication No. 088) released by the UDC Consortium under the Creative Commons Attribution Share Alike 3.0 license (first release 2009, subsequent update 2012).<a class="footnote-ref" id="fnref:31" href="#fn:31"><sup>31</sup></a> </p> <h3>Main tables</h3> <h4>0 <a href="/facts/Outline_of_science/P8wVFfV0">Science</a> and <a href="/facts/Outline_of_knowledge/JDyvCyst">knowledge</a>. Organization. <a href="/facts/Outline_of_computer_science/1lAxBHGF">Computer science</a>. Information. Documentation. Librarianship. Institution. Publications</h4> 00 Prolegomena. Fundamentals of knowledge and culture. Propaedeutics 001 <a href="/facts/Outline_of_science/P8wVFfV0">Science</a> and <a href="/facts/Outline_of_knowledge/JDyvCyst">knowledge</a> in general. Organization of intellectual work 002 Documentation. Books. Writings. Authorship 003 Writing systems and scripts 004 <a href="/facts/Outline_of_computer_science/1lAxBHGF">Computer science</a> and technology. Computing 004.2 <a href="/facts/Computer_architecture/tHtwxgR2">Computer architecture</a> 004.3 <a href="/facts/Computer_hardware/8jSjsCNv">Computer hardware</a> 004.4 <a href="/facts/Software/RP79lVSW">Software</a> 004.5 <a href="/facts/Human%25E2%2580%2593computer_interaction/EkmIxGCx">Human-computer interaction</a> 004.6 Data 004.7 Computer communication 004.8 <a href="/facts/Outline_of_artificial_intelligence/gpySbMRe">Artificial intelligence</a> 004.9 Application-oriented computer-based techniques 005 <a href="/facts/Outline_of_business_management/vrq5m3qx">Management</a> 005.1 Management Theory 005.2 Management agents. Mechanisms. Measures 005.3 Management activities 005.5 Management operations. Direction 005.6 Quality management. Total quality management (TQM) 005.7 Organizational management (OM) 005.9 Fields of management 005.92 Records management 005.93 Plant management. Physical resources management 005.94 <a href="/facts/Knowledge_management/RjjnVmRe">Knowledge management</a> 005.95/.96 Personnel management. Human Resources management 006 Standardization of products, operations, weights, measures and time 007 Activity and organizing. Information. Communication and control theory generally (cybernetics) 008 Civilization. <a href="/facts/Outline_of_culture/Wp6JGoch">Culture</a>. Progress 01 Bibliography and bibliographies. Catalogues 02 Librarianship 030 General reference works (as subject) 050 Serial publications, periodicals (as subject) 06 Organizations of a general nature 069 <a href="/facts/Museum/tp40SXuq">Museums</a> 070 Newspapers (as subject). The Press. Outline of <a href="/facts/Journalism/hue0m1xf">journalism</a> 08 Polygraphies. Collective works (as subject) 09 Manuscripts. Rare and remarkable works (as subject) <h4>1 <a href="/facts/Outline_of_philosophy/rVGFT3l6">Philosophy</a>. <a href="/facts/Outline_of_psychology/HlSs5Uap">Psychology</a></h4> 101 Nature and role of philosophy 11 <a href="/facts/Metaphysics/fSFt6SHe">Metaphysics</a> 111 General metaphysics. Ontology 122/129 Special Metaphysics 13 Philosophy of mind and spirit. Metaphysics of spiritual life 14 Philosophical systems and points of view 141 Kinds of viewpoint. Including: Monism. Dualism. Pluralism. Ontological Materialism. Metaphysical Idealism. Platonism, etc. 159.9 <a href="/facts/Outline_of_psychology/HlSs5Uap">Psychology</a> 159.91 Psychophysiology (physiological psychology). Mental physiology 159.92 Mental development and capacity. Comparative psychology 159.93 Sensation. Sensory perception 159.94 <a href="/facts/Executive_functions/QtflLj55">Executive functions</a> 159.95 Higher mental processes 159.96 Special mental states and processes 159.97 <a href="/facts/Abnormal_psychology/xqIJ7SNX">Abnormal psychology</a> 159.98 Applied psychology (psychotechnology) in general 16 <a href="/facts/Outline_of_logic/v8PTuyUG">Logic</a>. <a href="/facts/Outline_of_epistemology/5uRhyX82">Epistemology</a>. Theory of knowledge. Methodology of logic 17 Moral philosophy. <a href="/facts/Outline_of_ethics/Hx0FIX6D">Ethics</a>. Practical philosophy <h4>2 <a href="/facts/Outline_of_religion/PoMdH0Ek">Religion</a>. <a href="/facts/Outline_of_theology/appM4KvI">Theology</a></h4> <p>The UDC tables for religion are fully faceted. Indicated in italics below, are special auxiliary numbers that can be used to express attributes (facets) of any specific faith. Any special number can be combined with any religion e.g. <i>-5 Worship</i> can be used to express e.g. <i>26-5 Worship in Judaism</i>, <i>27-5 Worship in Christianity</i>, <i>24-5 Worship in Buddhism</i>. 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. </p> <i>2-1/-9 Special auxiliary subdivision for religion</i> <i>2-1 Theory and philosophy of religion. Nature of religion. Phenomenon of religion</i> <i>2-2 Evidences of religion</i> <i>2-3 Persons in religion</i> <i>2-4 Religious activities. Religious practice</i> <i>2-5 Worship broadly. Cult. Rites and ceremonies</i> <i>2-6 Processes in religion</i> <i>2-7 Religious organization and administration</i> <i>2-8 Religions characterised by various properties</i> <i>2-9 History of the faith, religion, denomination or church</i> 21/29 Religious systems. Religions and faiths 21 Prehistoric and primitive religions 22 Religions originating in the Far East 23 Religions originating in Indian sub-continent. Hindu religion in the broad sense 24 <a href="/facts/Outline_of_Buddhism/DeN8251B">Buddhism</a> 25 Religions of antiquity. Minor cults and religions 26 <a href="/facts/Outline_of_Judaism/HSv8QXez">Judaism</a> 27 <a href="/facts/Outline_of_Christianity/mW9u1VJC">Christianity</a> 28 <a href="/facts/Outline_of_Islam/MMk4hqW2">Islam</a> 29 <a href="/facts/New_religious_movement/7Ttfr321">Modern spiritual movements</a> <h4>3 <a href="/facts/Outline_of_social_science/27U5qdFK">Social sciences</a></h4> 303 Methods of the social sciences 304 Social questions. Social practice. Cultural practice. Way of life (Lebensweise) 305 Gender studies 308 Sociography. Descriptive studies of society (both qualitative and quantitative) 311 <a href="/facts/Outline_of_statistics/QoYhyaLD">Statistics</a> as a science. Statistical theory 314/316 <a href="/facts/Outline_of_society/bAkcCENf">Society</a> 314 Demography. Population studies 316 <a href="/facts/Outline_of_sociology/2FuU6cB4">Sociology</a> 32 <a href="/facts/Outline_of_politics/HRrzlbV0">Politics</a> 33 <a href="/facts/Outline_of_economics/g3aJ59MS">Economics</a>. Economic science 34 <a href="/facts/Outline_of_law/VI6tEX0L">Law</a>. Jurisprudence 35 Public administration. Government. Military affairs 36 Safeguarding the mental and material necessities of life 37 <a href="/facts/Outline_of_education/BCWprdcC">Education</a> 39 Cultural anthropology. Ethnography. Customs. Manners. Traditions. Way of life <h4>4 Currently Vacant</h4> <p>This section is currently vacant. </p> <h4>5 <a href="/facts/Outline_of_mathematics/bzYALmb2">Mathematics</a>. <a href="/facts/Outline_of_natural_science/4DM0XSMN">Natural sciences</a></h4> 502/504 Environmental science. Conservation of natural resources. Threats to the environment and protection against them 502 The environment and its protection 504 Threats to the environment 51 <a href="/facts/Outline_of_mathematics/bzYALmb2">Mathematics</a> 510 Fundamental and general considerations of mathematics 511 Number theory 512 <a href="/facts/Outline_of_algebra/g8ENY6uy">Algebra</a> 514 <a href="/facts/Outline_of_geometry/qtfa2Uby">Geometry</a> 517 <a href="/facts/Mathematical_analysis/XXeR26Ih">Analysis</a> 519.1 <a href="/facts/Combinatorial_analysis/k14xUoKT">Combinatorial analysis</a>. <a href="/facts/Graph_theory/VVPCd4TX">Graph theory</a> 519.2 <a href="/facts/Outline_of_probability/g17zdcbM">Probability</a>. Mathematical statistics 519.6 Computational mathematics. <a href="/facts/Outline_of_numerical_analysis/YlB1g58n">Numerical analysis</a> 519.7 Mathematical cybernetics 519.8 Operational research (OR): mathematical theories and methods 52 <a href="/facts/Outline_of_astronomy/cychwW28">Astronomy</a>. Astrophysics. <a href="/facts/Outline_of_space_exploration/Se4tkgCK">Space research</a>. Geodesy 53 <a href="/facts/Outline_of_physics/rfkSNY1X">Physics</a> 531/534 <a href="/facts/Mechanics/A3yHLQA5">Mechanics</a> 535 <a href="/facts/Optics/p0vq4S1T">Optics</a> 536 <a href="/facts/Heat/FjDGssCs">Heat</a>. <a href="/facts/Thermodynamics/q4hIx3yP">Thermodynamics</a>. <a href="/facts/Statistical_mechanics/6zMsNYYG">Statistical physics</a> 537 <a href="/facts/Electricity/hNC8D65W">Electricity</a>. <a href="/facts/Magnetism/eo75vApl">Magnetism</a>. <a href="/facts/Electromagnetism/oAkmALHT">Electromagnetism</a> 538.9 <a href="/facts/Condensed_matter_physics/EBVI5nmL">Condensed matter physics</a>. <a href="/facts/Solid-state_physics/Cmc6hvyR">Solid state physics</a> 539 Physical nature of matter 54 <a href="/facts/Outline_of_chemistry/q2E35daX">Chemistry</a>. Crystallography. Mineralogy 542 Practical laboratory chemistry. Preparative and experimental chemistry 543 <a href="/facts/Analytical_chemistry/MHQf3YP6">Analytical chemistry</a> 544 <a href="/facts/Physical_chemistry/WqwnJjRM">Physical chemistry</a> 546 <a href="/facts/Inorganic_chemistry/ErD6ypnb">Inorganic chemistry</a> 547 <a href="/facts/Outline_of_organic_chemistry/7tPVc9AP">Organic chemistry</a> 548/549 Mineralogical sciences. Crystallography. Mineralogy 55 <a href="/facts/Outline_of_earth_science/sGLvE4Qh">Earth sciences</a>. Geological sciences 56 <a href="/facts/Paleontology/60n5yldd">Paleontology</a> 57 Biological sciences in general 58 <a href="/facts/Outline_of_botany/yRNWPpBg">Botany</a> 59 <a href="/facts/Outline_of_zoology/5uUCxyxu">Zoology</a> <h4>6 <a href="/facts/Outline_of_applied_science/JsDaEAWL">Applied sciences</a>. <a href="/facts/Outline_of_medicine/fD6szUV5">Medicine</a>. <a href="/facts/Outline_of_technology/Xxm2VHux">Technology</a></h4> <p>Class 6 occupies the largest proportion of UDC schedules. It contains over 44,000 subdivisions. Each specific field of technology or industry usually contains more than one special auxiliary table with concepts needed to express operations, processes, materials and products. As a result, UDC codes are often created through the combination of various attributes. Equally, some parts of this class enumerate concepts to a great level of detail e.g. <i>621.882.212 Hexagon screws with additional shapes. Including: Flank screws. Collar screws. Cap screws</i> </p> 60 <a href="/facts/Outline_of_biotechnology/po35858T">Biotechnology</a> 61 Medical sciences 611/612 <a href="/facts/Human_biology/ypnyPsIs">Human biology</a> 613 Hygiene generally. Personal health and hygiene 614 Public health and hygiene. Accident prevention 615 <a href="/facts/Pharmacology/4Rx8s7Ie">Pharmacology</a>. <a href="/facts/Therapeutics/2ytkGbgT">Therapeutics</a>. <a href="/facts/Toxicology/L6XHRIJH">Toxicology</a> 616 <a href="/facts/Pathology/U9b18LJG">Pathology</a>. <a href="/facts/Clinical_medicine/2fnp90Je">Clinical medicine</a> 617 <a href="/facts/Surgery/fG8tWf5Y">Surgery</a>. <a href="/facts/Orthopaedics/ahXDk3gD">Orthopaedics</a>. <a href="/facts/Ophthalmology/024hdTWF">Ophthalmology</a> 618 <a href="/facts/Gynaecology/KKAAAcnb">Gynaecology</a>. <a href="/facts/Obstetrics/JbYHxtCd">Obstetrics</a> 62 <a href="/facts/Outline_of_engineering/PVGExPTG">Engineering</a>. <a href="/facts/Outline_of_technology/Xxm2VHux">Technology</a> in general 620 Materials testing. Commercial materials. Power stations. Economics of energy 621 Mechanical engineering in general. Nuclear technology. Electrical engineering. Machinery 622 <a href="/facts/Outline_of_mining/ARrLTJtp">Mining</a> 623 <a href="/facts/Military_engineering/dzAR2FJI">Military engineering</a> 624 Civil and structural engineering in general 625 Civil engineering of land transport. Railway engineering. Highway engineering 626/627 Hydraulic engineering and construction. Water (aquatic) structures 629 Transport vehicle engineering 63 <a href="/facts/Outline_of_agriculture/6CmWR9rM">Agriculture</a> and related sciences and techniques. Forestry. Farming. Wildlife exploitation 630 <a href="/facts/Forestry/puvod5MV">Forestry</a> 631/635 Farm management. Agronomy. Horticulture 633/635 Horticulture in general. Specific crops 636 Animal husbandry and breeding in general. Livestock rearing. Breeding of domestic animals 64 Home economics. Domestic science. Housekeeping 65 Communication and transport industries. Accountancy. Business management. Public relations 654 Telecommunication and telecontrol (organization, services) 655 Graphic industries. Printing. Publishing. Book trade 656 Transport and postal services. Traffic organization and control 657 <a href="/facts/Accounting/sHznDY3V">Accountancy</a> 658 <a href="/facts/Outline_of_business_management/vrq5m3qx">Business management</a>, administration. Commercial organization 659 Publicity. Information work. <a href="/facts/Outline_of_public_relations/YwxdQfEE">Public relations</a> 66 Chemical technology. Chemical and related industries 67 Various industries, trades and crafts 68 Industries, crafts and trades for finished or assembled articles 69 Building (<a href="/facts/Outline_of_construction/TQdEqKqM">construction</a>) trade. Building materials. Building practice and procedure <h4>7 The arts. Recreation. <a href="/facts/Outline_of_entertainment/1LdSoosY">Entertainment</a>. <a href="/facts/Outline_of_sports/QnhomqhE">Sport</a></h4> <i>7.01/.09 Special auxiliary subdivision for the arts</i> <i>7.01 Theory and philosophy of art. Principles of design, proportion, optical effect</i> <i>7.02 Art technique. Craftsmanship</i> <i>7.03 Artistic periods and phases. Schools, styles, influences</i> <i>7.04 Subjects for artistic representation. Iconography. Iconology</i> <i>7.05 Applications of art (in industry, trade, the home, everyday life)</i> <i>7.06 Various questions concerning art</i> <i>7.07 Occupations and activities associated with the arts and entertainment</i> <i>7.08 Characteristic features, forms, combinations etc. (in art, entertainment and sport)</i> <i>7.091 Performance, presentation (in original medium)</i> 71 Physical planning. Regional, town and country planning. Landscapes, parks, gardens 72 <a href="/facts/Outline_of_architecture/HKurKfl5">Architecture</a> 73 Plastic arts 74 <a href="/facts/Outline_of_drawing_and_drawings/4EkS6V3N">Drawing</a>. <a href="/facts/Outline_of_design/S3MY6QnF">Design</a>. <a href="/facts/Outline_of_crafts/p7enVKsa">Applied arts and crafts</a> 745/749 Industrial and domestic arts and crafts. Applied arts 75 <a href="/facts/Outline_of_painting/dUyLrB1Y">Painting</a> 76 Graphic art, printmaking. Graphics 77 <a href="/facts/Outline_of_photography/y13QSNau">Photography</a> and similar processes 78 <a href="/facts/Outline_of_music/NGXbpV68">Music</a> 79 Recreation. <a href="/facts/Outline_of_entertainment/1LdSoosY">Entertainment</a>. <a href="/facts/Outline_of_games/Lf9SnyTE">Games</a>. <a href="/facts/Outline_of_sports/QnhomqhE">Sport</a> 791 Cinema. <a href="/facts/Outline_of_film/H5SyKX9k">Films</a> (motion pictures) 792 <a href="/facts/Outline_of_theatre/qltJRUrW">Theatre</a>. <a href="/facts/Outline_of_stagecraft/r1VJKcPP">Stagecraft</a>. Dramatic performances 793 Social entertainments and recreations. Art of movement. <a href="/facts/Outline_of_dance/tSe7Gcnn">Dance</a> 794 Board and table games (of thought, skill and chance) 796 <a href="/facts/Outline_of_sports/QnhomqhE">Sport</a>. <a href="/facts/Outline_of_games/Lf9SnyTE">Games</a>. <a href="/facts/Outline_of_exercise/M2X4Gkzd">Physical exercises</a> 797 Water sports. Aerial sports 798 Riding and driving. Horse and other animal sports 799 Sport fishing. Sport hunting. Shooting and target sports <h4>8 Language. <a href="/facts/Outline_of_linguistics/kJ601X2e">Linguistics</a>. <a href="/facts/Outline_of_literature/xnye0Amb">Literature</a></h4> <p>Tables for class 8 are fully faceted and details are expressed through combination with common auxiliaries of language (Table 1c) and a series of special auxiliary tables to indicate other facets or attributes in Linguistics or Literature. As a result, this class allows for great specificity in indexing although the schedules themselves occupy very little space in UDC. The subdivisions of e.g. <i>811 Languages</i> or <i>821 Literature</i> are derived from common auxiliaries of language =1/=9 (Table 1c) by substituting a point for the equals sign, e.g. 811.111 English language (as a subject of a linguistic study) and <i>821.111 English literature</i> derives from <i>=111 English language</i>. Common auxiliaries of place and time are also frequently used in this class to express place and time facets of Linguistics or Literature, e.g. <i>821.111(71)"18" English literature of Canada in 19th century</i> </p> 80 General questions relating to both linguistics and literature. Philology 801 Prosody. Auxiliary sciences and sources of philology 808 Rhetoric. The effective use of language 81 <a href="/facts/Outline_of_linguistics/kJ601X2e">Linguistics</a> and languages <i>81`1/`4 Special auxiliary subdivision for subject fields and facets of linguistics and languages</i> <i> 81`1 General linguistics</i> <i>81`2 <a href="/facts/Outline_of_semiotics/sTbaUlrD">Theory of signs</a>. Theory of translation. Standardization. Usage. Geographical linguistics</i> <i>81`3 Mathematical and applied linguistics. Phonetics. Graphemics. Grammar. Semantics. Stylistics</i> <i>81`4 Text linguistics, Discourse analysis. Typological linguistics</i> <i>81`42 Text linguistics. Discourse analysis</i> <i>81`44 Typological linguistics</i> 811 Languages Derived from the common auxiliaries of language =1/=9 (Table 1c) by replacing the equal sign = with prefix <i>811.</i> e.g. <i>=111 English</i> becomes <i>811.111 Linguistics of English language</i> 811.1/.9 All languages natural or artificial 811.1/.8 Individual natural languages 811.1/.2 Indo-European languages 811.21/.22 Indo-Iranian languages 811.3 Dead languages of unknown affiliation. Caucasian languages 811.4 Afro-Asiatic, Nilo-Saharan, Congo-Kordofanian, Khoisan languages 811.5 Ural-Altaic, Palaeo-Siberian, Eskimo-Aleut, Dravidian and Sino-Tibetan languages. Japanese. Korean. Ainu 811.6 Austro-Asiatic languages. Austronesian languages 811.7 Indo-Pacific (non-Austronesian) languages. Australian languages 811.8 American indigenous languages 811.9 Artificial languages 82 <a href="/facts/Outline_of_literature/xnye0Amb">Literature</a> <i>82-1/-9 Special auxiliary subdivision for literary forms, genres</i> <i>82-1 <a href="/facts/Outline_of_poetry/TsK7sdpm">Poetry</a>. Poems. Verse</i> <i>82-2 Drama. Plays</i> <i>82-3 <a href="/facts/Outline_of_fiction/nkhUozQy">Fiction</a>. Prose narrative</i> <i>82-31 Novels. Full-length stories</i> <i>82-32 Short stories. Novellas</i> <i>82-4 Essays</i> <i>82-5 Oratory. Speeches</i> <i>82-6 Letters. Art of letter-writing. Correspondence. Genuine letters</i> <i>82-7 Prose satire. Humour, epigram, parody</i> <i>82-8 Miscellanea. Polygraphies. Selections</i> <i>82-9 Various other literary forms</i> <i>82-92 Periodical literature. Writings in serials, journals, reviews</i> <i>82-94 History as literary genre. Historical writing. Historiography. Chronicles. Annals. Memoirs</i> <i>82.02/.09 Special auxiliary subdivision for theory, study and technique of literature</i> <i>82.02 Literary schools, trends and movements</i> <i>82.09 Literary criticism. Literary studies</i> <i>82.091 Comparative literary studies. Comparative literature</i> 821 Literatures of individual languages and language families Derived from the common auxiliaries of language =1/=9 (Table 1c) by replacing the equal sign = with prefix <i>821.</i> e.g. <i>=111 English</i> becomes <i>821.111 English literature</i> <h4>9 <a href="/facts/Outline_of_geography/NuJyWqhU">Geography</a>. Biography. <a href="/facts/Outline_of_history/tlejX1DQ">History</a></h4> <p>Tables for Geography and History in UDC are fully faceted and place, time and ethnic grouping facets are expressed through combination with common auxiliaries of place (Table 1d), ethnic grouping (Table 1f) and time (Table 1g) </p> 902/908 Archaeology. Prehistory. Cultural remains. Area studies 902 <a href="/facts/Outline_of_archaeology/jgFHFyA6">Archaeology</a> 903 Prehistory. Prehistoric remains, artifacts, antiquities 904 Cultural remains of historical times 908 Area studies. Study of a locality 91 <a href="/facts/Outline_of_geography/NuJyWqhU">Geography</a>. Exploration of the Earth and of individual countries. Travel. <a href="/facts/Outline_of_geography/NuJyWqhU">Regional geography</a> 910 General questions. Geography as a science. Exploration. Travel 911 General geography. Science of geographical factors (systematic geography). Theoretical geography 911.2 <a href="/facts/Outline_of_geography/NuJyWqhU">Physical geography</a> 911.3 <a href="/facts/Outline_of_geography/NuJyWqhU">Human geography</a> (cultural geography). Geography of cultural factors 911.5/.9 Theoretical geography 912 Nonliterary, nontextual representations of a region 913 <a href="/facts/Outline_of_geography/NuJyWqhU">Regional geography</a> 92 Biographical studies. Genealogy. Heraldry. Flags 929 Biographical studies 929.5 Genealogy 929.6 Heraldry 929.7 Nobility. Titles. Peerage 929.9 Flags. Standards. Banners 93/94 <a href="/facts/Outline_of_history/tlejX1DQ">History</a> 930 Science of history. Historiography 930.1 History as a science 930.2 Methodology of history. Ancillary historical sciences 930.25 Archivistics. Archives (including public and other records) 930.85 History of civilization. Cultural history 94 General <h3>Common auxiliary tables</h3> <h4>Common auxiliaries of language. Table 1c</h4> =1/=9 Languages (natural and artificial) =1/=8 Natural languages =1/=2 Indo-European languages =1 Indo-European languages of Europe =11 Germanic languages =12 Italic languages =13 Romance languages =14 Greek (Hellenic) =15 Celtic languages =16 Slavic languages =17 Baltic languages =18 Albanian =19 Armenian =2 Indo-Iranian, Nuristani (Kafiri) and dead Indo-European languages =21/=22 Indo-Iranian languages =21 Indic languages =22 Iranian languages =29 Dead Indo-European languages (not listed elsewhere) =3 Dead languages of unknown affiliation. Caucasian languages =34 Dead languages of unknown affiliation, spoken in the Mediterranean and Near East (except Semitic) =35 Caucasian languages =4 Afro-Asiatic, Nilo-Saharan, Congo-Kordofanian, Khoisan languages =41 Afro-Asiatic (Hamito-Semitic) languages =42 Nilo-Saharan languages =43 Congo-Kordofanian (Niger-Kordofanian) languages =45 Khoisan languages =5 Ural-Altaic, Palaeo-Siberian, Eskimo-Aleut, Dravidian and Sino-Tibetan languages. Japanese. Korean. Ainu =51 Ural-Altaic languages =521 Japanese =531 Korean =541 Ainu =55 Palaeo-Siberian languages =56 Eskimo-Aleut languages =58 Sino-Tibetan languages =6 Austro-Asiatic languages. Austronesian languages =61 Austro-Asiatic languages =62 Austronesian languages =7 Indo-Pacific (non-Austronesian) languages. Australian languages =71 Indo-Pacific (non-Austronesian) languages =72 Australian languages =8 American indigenous languages =81 Indigenous languages of Canada, USA and Northern-Central Mexico =82 Indigenous languages of western North American Coast, Mexico and Yucatán =84/=88 Central and South American indigenous languages =84 Ge-Pano-Carib languages. Macro-Chibchan languages =85 Andean languages. Equatorial languages =86 Chaco languages. Patagonian and Fuegian languages =88 Isolated, unclassified Central and South American indigenous languages =9 Artificial languages =92 Artificial languages for use among human beings. International auxiliary languages (interlanguages) =93 Artificial languages used to instruct machines. Programming languages. Computer languages <h4>(0...) Common auxiliaries of form. Table 1d</h4> <i>(0.02/.08) Special auxiliary subdivision for document form</i> <i>(0.02) Documents according to physical, external form</i> <i>(0.03) Documents according to method of production</i> <i>(0.032) Handwritten documents (autograph, holograph copies). Manuscripts. Pictorial documents (drawings, paintings)</i> <i>(0.034) Machine-readable documents</i> <i>(0.04) Documents according to stage of production</i> <i>(0.05) Documents for particular kinds of user</i> <i>(0.06) Documents according to level of presentation and availability</i> <i>(0.07) Supplementary matter issued with a document</i> <i>(0.08) Separately issued supplements or parts of documents</i> (01) Bibliographies (02) Books in general (03) Reference works (04) Non-serial separates. Separata (041) Pamphlets. Brochures (042) Addresses. Lectures. Speeches (043) Theses. Dissertations (044) Personal documents. Correspondence. Letters. Circulars (045) Articles in serials, collections etc. Contributions (046) Newspaper articles (047) Reports. Notices. Bulletins (048) Bibliographic descriptions. Abstracts. Summaries. Surveys (049) Other non-serial separates (05) Serial publications. Periodicals (06) Documents relating to societies, associations, organizations (07) Documents for instruction, teaching, study, training (08) Collected and polygraphic works. Forms. Lists. Illustrations. Business publications (09) Presentation in historical form. Legal and historical sources (091) Presentation in chronological, historical form. Historical presentation in the strict sense (092) Biographical presentation (093) Historical sources (094) Legal sources. Legal documents <h4>(1/9) Common auxiliaries of place. Table 1e</h4> (1) Place and space in general. Localization. Orientation <i>(1-0/-9) Special auxiliary subdivision for boundaries and spatial forms of various kinds</i> <i>(1-0) Zones</i> <i>(1-1) Orientation. Points of the compass. Relative position</i> <i>(1-11) East. Eastern</i> <i>(1-13) South. Southern</i> <i>(1-14) South-west. South-western</i> <i>(1-15) West. Western</i> <i>(1-17) North. Northern</i> <i>(1-19) Relative location, direction and orientation</i> <i>(1-2) Lowest administrative units. Localities</i> <i>(1-5) Dependent or semi-dependent territories</i> <i>(1-6) States or groupings of states from various points of view</i> <i>(1-7) Places and areas according to privacy, publicness and other special features</i> <i>(1-8) Location. Source. Transit. Destination</i> <i>(1-9) Regionalization according to specialized points of view</i> (100) Universal as to place. International. All countries in general (2) Physiographic designation (20) Ecosphere (21) Surface of the Earth in general. Land areas in particular. Natural zones and regions (23) Above sea level. Surface relief. Above ground generally. Mountains (24) Below sea level. Underground. Subterranean (25) Natural flat ground (at, above or below sea level). The ground in its natural condition, cultivated or inhabited (26) Oceans, seas and interconnections (28) Inland waters (29) The world according to physiographic features (3) Places of the ancient and mediaeval world (31) Ancient China and Japan (32) <a href="/facts/Outline_of_ancient_Egypt/kot7xn5X">Ancient Egypt</a> (33) Ancient Roman Province of Judaea. The Holy Land. Region of the Israelites (34) <a href="/facts/Outline_of_ancient_India/tHLg7whz">Ancient India</a> (35) Medo-Persia (36) Regions of the so-called barbarians (37) Italia. <a href="/facts/Outline_of_ancient_Rome/Qrqb1LPb">Ancient Rome</a> and Italy (38) <a href="/facts/Outline_of_ancient_Greece/xbhFnT9w">Ancient Greece</a> (399) Other regions. Ancient geographical divisions other than those of classical antiquity (4/9) Countries and places of the modern world (4) <a href="/facts/Outline_of_Europe/JdRvAhtI">Europe</a> (5) <a href="/facts/Outline_of_Asia/KJEzDSrt">Asia</a> (6) <a href="/facts/Outline_of_Africa/eQsFW5nB">Africa</a> (7) <a href="/facts/Outline_of_North_America/mfFC8kz3">North</a> and Central America (8) <a href="/facts/Outline_of_South_America/Lve75mBX">South America</a> (9) States and regions of the South Pacific and <a href="/facts/Outline_of_Australia/n5JbGqRg">Australia</a>. Arctic. Antarctic <h4>(=...) Common auxiliaries of human ancestry, ethnic grouping and nationality. Table 1f</h4> <p><i>They are derived mainly from the common auxiliaries of language =... (Table 1c) and so may also usefully distinguish linguistic-cultural groups, e.g. =111 English is used to represent (=111) English speaking peoples</i> </p> (=01) Human ancestry groups (=011) European Continental Ancestry Group (=012) Asian Continental Ancestry Group (=013) African Continental Ancestry Group (=014) Oceanic Ancestry Group (=017) American Native Continental Ancestry Group (=1/=8) Linguistic-cultural groups, ethnic groups, peoples [derived from Table 1c] (=1:1/9) Peoples associated with particular places <i>e.g. (=111:71) Anglophone population of Canada</i> <h4>"..." Common auxiliaries of time. Table 1g</h4> "0/2" Dates and ranges of time (CE or AD) in conventional Christian (Gregorian) reckoning "0" First millennium CE "1" Second millennium CE "2" Third millennium CE "3/7" Time divisions other than dates in Christian (Gregorian) reckoning "3" Conventional time divisions and subdivisions: numbered, named, etc. "4" Duration. Time-span. Period. Term. Ages and age-groups "5" Periodicity. Frequency. Recurrence at specified intervals. "6" Geological, archaeological and cultural time divisions "61/62" Geological time division "63" Archaeological, prehistoric, protohistoric periods and ages "67/69" Time reckonings: universal, secular, non-Christian religious "67" Universal time reckoning. Before Present "68" Secular time reckonings other than universal and the Christian (Gregorian) calendar "69" Dates and time units in non-Christian (non-Gregorian) religious time reckonings "7" Phenomena in time. Phenomenology of time <h4>-0 Common auxiliaries of general characteristics. Table 1k</h4> -02 Common auxiliaries of properties -021 Properties of existence -022 Properties of magnitude, degree, quantity, number, temporal values, dimension, size -023 Properties of shape -024 Properties of structure. Properties of position -025 Properties of arrangement -026 Properties of action and movement -027 Operational properties -028 Properties of style and presentation -029 Properties derived from other main classes -03 Common auxiliaries of materials -032 Naturally occurring mineral materials -033 Manufactured mineral-based materials -034 Metals -035 Materials of mainly organic origin -036 Macromolecular materials. Rubbers and plastics -037 Textiles. Fibres. Yarns. Fabrics. Cloth -039 Other materials -04 Common auxiliaries of relations, processes and operations -042 Phase relations -043 General processes -043.8/.9 Processes of existence -045 Processes related to position, arrangement, movement, physical properties, states of matter -047/-049 General operations and activities -05 Common auxiliaries of persons and personal characteristics -051 Persons as agents, doers, practitioners (studying, making, serving etc.) -052 Persons as targets, clients, users (studied, served etc.) -053 Persons according to age or age-groups -054 Persons according to ethnic characteristics, nationality, citizenship etc. -055 Persons according to gender and kinship -056 Persons according to constitution, health, disposition, hereditary or other traits -057 Persons according to occupation, work, livelihood, education -058 Persons according to social class, civil status <h2 id="see-also">See also</h2> <h3>Special classifications based on or used in combination with UDC</h3> <ul><li><a href="/facts/Lonclass/b2WBcV9Y">BBC LonClass</a></li></ul> <h3>Other faceted classifications</h3> <ul><li><a href="/facts/Bliss_bibliographic_classification/TWSe0AUh">Bliss bibliographic classification</a></li> <li><a href="/facts/Colon_classification/PWMgIwMA">Colon classification</a></li></ul> <h3>Other library classifications</h3> <ul><li><a href="/facts/Dewey_Decimal_Classification/BsT2QEP2">Dewey Decimal Classification</a></li> <li><a href="/facts/Library_of_Congress_Classification/lQ61tkz3">Library of Congress Classification</a></li> <li><a href="/facts/Chinese_Library_Classification/6F3d3QjX">Chinese Library Classification</a></li> <li><a href="/facts/Harvard-Yenching_Classification/CFpuPe9r">Harvard-Yenching Classification</a></li></ul> <h2 id="external-links">External links</h2> <a href="/facts/Wikidata/5Myy74K5">Wikidata</a> has the property: <ul><li> <i>Universal Decimal Classification (P1190)</i> (see <a href="https://query.wikidata.org/embed.html#SELECT%20%3FWikidata_item_%20%3FWikidata_item_Label%20%3Fvalue%20%3FvalueLabel%20%3FEnglish_Wikipedia_article%20%23Show%20data%20in%20this%20order%0A%7B%0A%09%3FWikidata_item_%20wdt%3AP1190%20%3Fvalue%20.%20%23Collecting%20all%20items%20which%20have%20P1190%20data%2C%20from%20whole%20Wikidata%20item%20pages%0A%09OPTIONAL%20%7B%3FEnglish_Wikipedia_article%20schema%3Aabout%20%3FWikidata_item_%3B%20schema%3AisPartOf%20%3Chttps%3A%2F%2Fen.wikipedia.org%2F%3E%20.%7D%20%23If%20collected%20item%20has%20link%20to%20English%20Wikipedia%2C%20show%20that%0A%09SERVICE%20wikibase%3Alabel%20%7B%20bd%3AserviceParam%20wikibase%3Alanguage%20%22en%22%20%20%7D%20%23Show%20label%20in%20this%20language.%20%22en%22%20is%20English.%20%20%20%0A%7D%0ALIMIT%201000">uses</a>)</li></ul> <ul><li><a href="http://www.udcc.org/">Universal Decimal Classification Consortium</a> <ul><li><a href="http://www.udcc.org/about.htm">About Universal Decimal Classification</a></li> <li><a href="http://www.udcc.org/udcsummary/php/index.php">Multilingual UDC Summary</a></li> <li><a href="http://udcdata.info/">UDC Linked Data</a></li></ul></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>"UDC Fact Sheet". UDC Consortium website. Retrieved 28 October 2018. <a href="http://www.udcc.org/index.php/site/page?view=factsheet" target="_blank">http://www.udcc.org/index.php/site/page?view=factsheet</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>McIlwaine, I. C. (2007). Universal Decimal Classification: a guide to its use (Revised ed.). The Hague: UDC Consortium. <a href="/wiki/Ia_McIlwaine" target="_blank">/wiki/Ia_McIlwaine</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>McIlwaine, I. C. (2009). "Universal Decimal Classification (UDC)". Encyclopedia of Library and Information Sciences (Third ed.). pp. 5432–5439. doi:10.1081/E-ELIS3-120043532. ISBN 978-0-8493-9712-7. <a href="978-0-8493-9712-7" target="_blank">978-0-8493-9712-7</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>"Universal Decimal Classification 1: General properties and basic number building". Essential Classification. 2017. pp. 241–264. doi:10.29085/9781783302383.019. ISBN 9781783302383. <a href="9781783302383" target="_blank">9781783302383</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>"Universal Decimal Classification 2: Auxiliary tables". Essential Classification. 2017. pp. 265–298. doi:10.29085/9781783302383.020. ISBN 9781783302383. <a href="9781783302383" target="_blank">9781783302383</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>UDC History, "About UDC" - UDC Consortium website <a href="http://www.udcc.org/index.php/site/page?view=about_history" target="_blank">http://www.udcc.org/index.php/site/page?view=about_history</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>McIlwaine, I. C. (1997). "The Universal Decimal Classification: Some factors concerning its origins, development, and influence". Journal of the American Society for Information Science. 48 (4): 331–339. doi:10.1002/(SICI)1097-4571(199704)48:4<331::AID-ASI6>3.0.CO;2-X. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> <li id="fn:8"><p>UDC Consortium, UDC Consortium website <a href="http://www.udcc.org/index.php/site/page?view=about_udcc" target="_blank">http://www.udcc.org/index.php/site/page?view=about_udcc</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></p></li> <li id="fn:9"><p>UDC Editions, UDC Consortium website <a href="http://www.udcc.org/index.php/site/page?view=editions" target="_blank">http://www.udcc.org/index.php/site/page?view=editions</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></p></li> <li id="fn:10"><p>Slavic, A. (November 2004). "UDC Translations: a 2004 Survey Report and Bibliography". Extensions & Corrections to the UDC. 26 (2004): 58–80. hdl:10150/106363. <a href="/wiki/Hdl_(identifier)" target="_blank">/wiki/Hdl_(identifier)</a> <a href="#fnref:10" class="footnote-back-ref">↩</a></p></li> <li id="fn:11"><p>"Universal Decimal Classification Summary". UDC Consortium. Retrieved April 13, 2022. <a href="http://www.udcc.org/udcsummary/php/index.php" target="_blank">http://www.udcc.org/udcsummary/php/index.php</a> <a href="#fnref:11" class="footnote-back-ref">↩</a></p></li> <li id="fn:12"><p>Major Revisions of the UDC 1993-2013, UDC Consortium website <a href="http://www.udcc.org/index.php/site/page?view=major_revisions" target="_blank">http://www.udcc.org/index.php/site/page?view=major_revisions</a> <a href="#fnref:12" class="footnote-back-ref">↩</a></p></li> <li id="fn:13"><p>Slavic, A.; Cordeiro, M. I.; Riesthuis, G. (June 2008). "Maintenance of the Universal Decimal Classification: overview of the past and preparations for the future". International Cataloguing and Bibliographic Control. 37 (2): 23–29. hdl:10150/105220. <a href="/wiki/Hdl_(identifier)" target="_blank">/wiki/Hdl_(identifier)</a> <a href="#fnref:13" class="footnote-back-ref">↩</a></p></li> <li id="fn:14"><p>Slavic, A. (2004). "UDC implementation: from library shelves to a structured indexing language". International Cataloguing and Bibliographic Control. 33.3 (2004): 60–65. hdl:10150/105685. <a href="/wiki/Hdl_(identifier)" target="_blank">/wiki/Hdl_(identifier)</a> <a href="#fnref:14" class="footnote-back-ref">↩</a></p></li> <li id="fn:15"><p>Rayward, W. Boyd: From the index card to the World City: knowledge organization and visualization in the work and ideas of Paul Otlet. IN: A. Slavic, A. Akdag Salah and S. Davies (Eds.): Proceedings of the International UDC Seminar 2013: Classification & Visualization: Interfaces to Knowledge, The Hague (Netherlands), 24–25 October 2013. Wurzburg: Ergon Verlag, 2013, pp. 1-41 <a href="#fnref:15" class="footnote-back-ref">↩</a></p></li> <li id="fn:16"><p>"Universal Bibliographic Repertory". UNESCO Memory of the World Programme. Retrieved 2025-04-04. <a href="https://www.unesco.org/en/memory-world/universal-bibliographic-repertory" target="_blank">https://www.unesco.org/en/memory-world/universal-bibliographic-repertory</a> <a href="#fnref:16" class="footnote-back-ref">↩</a></p></li> <li id="fn:17"><p>Slavic, A. (2006). "Use of the Universal Decimal Classification: a worldwide survey". Journal of Documentation. 64 (2): 211–228. doi:10.1108/00220410810858029. hdl:10150/105579. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:17" class="footnote-back-ref">↩</a></p></li> <li id="fn:18"><p>"UDC Users Worldwide". UDC Consortium website. <a href="http://www.udcc.org/index.php/site/page?view=users_worldwide" target="_blank">http://www.udcc.org/index.php/site/page?view=users_worldwide</a> <a href="#fnref:18" class="footnote-back-ref">↩</a></p></li> <li id="fn:19"><p>"UDC Countries". UDC Consortium. <a href="http://www.udcc.org/countries.htm" target="_blank">http://www.udcc.org/countries.htm</a> <a href="#fnref:19" class="footnote-back-ref">↩</a></p></li> <li id="fn:20"><p>Collections indexed by UDC, UDC Consortium website <a href="http://www.udcc.org/index.php/site/page?view=collections" target="_blank">http://www.udcc.org/index.php/site/page?view=collections</a> <a href="#fnref:20" class="footnote-back-ref">↩</a></p></li> <li id="fn:21"><p>"Yeast Systematics: from Phenotype to Genotype". Food Technology and Biotechnology. ISSN 1330-9862. Retrieved 28 October 2018. Example: Journal article indexed by UDC <a href="http://www.ftb.pbf.hr/index.php/ftb/article/viewFile/243/241" target="_blank">http://www.ftb.pbf.hr/index.php/ftb/article/viewFile/243/241</a> <a href="#fnref:21" class="footnote-back-ref">↩</a></p></li> <li id="fn:22"><p>"The game method as means of interface of technical-tactical and psychological preparation in sports orienteering" (PDF). Pedagogico-psychological and Medico-biological Problems of the Physical Culture and Sport (in Russian). ISSN 2070-4798. Retrieved 28 October 2018. Example: Journal article indexed by UDC <a href="http://www.kamgifk.ru/magazin/20_%283%29_2011/20_%283%29_2011_16.pdf" target="_blank">http://www.kamgifk.ru/magazin/20_%283%29_2011/20_%283%29_2011_16.pdf</a> <a href="#fnref:22" class="footnote-back-ref">↩</a></p></li> <li id="fn:23"><p>"Residual Stress in Shot-Peened Sheets of AIMg4.5Mn Alloy". Materials and Technology. ISSN 1580-2949. Retrieved 28 October 2018. Example: Journal article indexed by UDC <a href="http://www.docstoc.com/docs/5320753/UDK-Pregledni-znanstveni-lanek-ISSN-MTAEC-M-MI-OVI" target="_blank">http://www.docstoc.com/docs/5320753/UDK-Pregledni-znanstveni-lanek-ISSN-MTAEC-M-MI-OVI</a> <a href="#fnref:23" class="footnote-back-ref">↩</a></p></li> <li id="fn:24"><p>Slavic, A. (December 2006). "The level of exploitation of Universal Decimal Classification in library OPACs: a pilot study". Vjesnik Bibliotekara Hrvatske. 49 (3–4): 155–182. hdl:10150/105346. <a href="/wiki/Hdl_(identifier)" target="_blank">/wiki/Hdl_(identifier)</a> <a href="#fnref:24" class="footnote-back-ref">↩</a></p></li> <li id="fn:25"><p>Slavic, A. (2006). "UDC in subject gateways: experiment or opportunity?". Knowledge Organization. 33 (2): 67–85. hdl:10150/105276. <a href="/wiki/Hdl_(identifier)" target="_blank">/wiki/Hdl_(identifier)</a> <a href="#fnref:25" class="footnote-back-ref">↩</a></p></li> <li id="fn:26"><p>UDC Master Reference File, UDC Consortium website <a href="http://www.udcc.org/index.php/site/page?view=mrf" target="_blank">http://www.udcc.org/index.php/site/page?view=mrf</a> <a href="#fnref:26" class="footnote-back-ref">↩</a></p></li> <li id="fn:27"><p>"UDC Fact Sheet". UDC Consortium website. Retrieved 28 October 2018. <a href="http://www.udcc.org/index.php/site/page?view=factsheet" target="_blank">http://www.udcc.org/index.php/site/page?view=factsheet</a> <a href="#fnref:27" class="footnote-back-ref">↩</a></p></li> <li id="fn:28"><p>"Universal Decimal Classification Summary". UDC Consortium. Retrieved April 13, 2022. <a href="http://www.udcc.org/udcsummary/php/index.php" target="_blank">http://www.udcc.org/udcsummary/php/index.php</a> <a href="#fnref:28" class="footnote-back-ref">↩</a></p></li> <li id="fn:29"><p>UDC Subject Coverage, UDC Consortium website <a href="http://www.udcc.org/index.php/site/page?view=subject_coverage" target="_blank">http://www.udcc.org/index.php/site/page?view=subject_coverage</a> <a href="#fnref:29" class="footnote-back-ref">↩</a></p></li> <li id="fn:30"><p>UDC Structure and Tables, UDC Consortium website <a href="http://www.udcc.org/index.php/site/page?view=about_structure" target="_blank">http://www.udcc.org/index.php/site/page?view=about_structure</a> <a href="#fnref:30" class="footnote-back-ref">↩</a></p></li> <li id="fn:31"><p>"Universal Decimal Classification Summary". UDC Consortium. Retrieved April 13, 2022. <a href="http://www.udcc.org/udcsummary/php/index.php" target="_blank">http://www.udcc.org/udcsummary/php/index.php</a> <a href="#fnref:31" class="footnote-back-ref">↩</a></p></li> </ol>