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. They have unique notational representations that makes 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. =... Common auxiliaries of language. Table 1c (0...) Common auxiliaries of form. Table 1d (1/9) Common auxiliaries of place. Table 1e (=...) Common auxiliaries of human ancestry, ethnic grouping and nationality. Table 1f "..." Common auxiliaries of time. Table 1g helps to make minute division of time e.g.: "1993-1996" -0... Common auxiliaries of general characteristics: Properties, Materials, Relations/Processes and Persons. Table 1k. -02 Common auxiliaries of properties. Table 1k -03 Common auxiliaries of materials. Table 1k -04 Common auxiliaries of relations, processes and operations. Table 1k -05 Common auxiliaries of persons and personal characteristics. Table 1k this table is repeated Connecting signs 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: UDC outline 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). Main tables 0 Science and knowledge. Organization. Computer science. Information. Documentation. Librarianship. Institution. Publications 00 Prolegomena. Fundamentals of knowledge and culture. Propaedeutics 001 Science and knowledge in general. Organization of intellectual work 002 Documentation. Books. Writings. Authorship 003 Writing systems and scripts 004 Computer science and technology. Computing 004.2 Computer architecture 004.3 Computer hardware 004.4 Software 004.5 Human-computer interaction 004.6 Data 004.7 Computer communication 004.8 Artificial intelligence 004.9 Application-oriented computer-based techniques 005 Management 005.1 Management Theory 005.2 Management agents. Mechanisms. Measures 005.3 Management activities 005.5 Management operations. Direction 005.6 Quality management.