Classification

This paper presents a comprehensive revision proposal for the treatment of viruses, bacteria, and protists within the Universal Decimal Classification (UDC), addressing long-standing inconsistencies resulting from rapid transformations in biological systematics. Traditional classificatory structures based on the five-kingdom model have become increasingly untenable in light of molecular phylogenetics and the consolidation of the three-domain system (Bacteria, Archaea, Eukarya). At the same time, the taxonomic status of "Protista" has been profoundly destabilized, with the group no longer recognized as a coherent phylogenetic entity.

The proposal analyzes the structural problems generated by these developments within UDC schedules, including outdated hierarchies, ambiguous placements, artificial groupings, and the fragmentation of microbiological domains across classes. It recommends a reorganization aligned with contemporary scientific consensus while preserving the architectural integrity and notation stability of the classification scheme. Revisions include the explicit recognition of Archaea, restructuring of bacterial subdivisions, reconsideration of viral classification in relation to host-based arrangements, and the dismantling of Protista as a unified category in favor of phylogenetically grounded groupings.

Throughout the proposal, particular care is taken to balance scientific accuracy with documentary functionality, ensuring that revised structures remain operable for indexing, retrieval, and database management. The work exemplifies the methodological challenges of maintaining a global knowledge organization system in domains where scientific paradigms are rapidly evolving.

This report presents the outcomes of stages three to six of the UDC Biology Revision Project, a systematic effort to realign the biological schedules of the Universal Decimal Classification (UDC) with contemporary scientific taxonomy while preserving documentary stability. Following earlier revisions of Vertebrata (2010) and Botany (2011), these stages address Invertebrates; Algae, Fungi, Bryophyta and Pteridophyta; and propose structural reforms for Chromista, Protista, Bacteria and Viruses.

The revision of Invertebrates (592/595) involved a complete reorganization of hierarchies that had remained largely unchanged since the 1980s. Deprecated taxa, incorrect subordinations, and outdated evolutionary assumptions were corrected through relocation, span classes, and notational restructuring. Where necessary, obsolete but widely used folk taxa were preserved with explicit scientific qualification, balancing literary warrant with phylogenetic accuracy.

The revision of algae, fungi and early plant lineages confronted structural constraints inherent to disciplinary placement within UDC. Although modern systematics recognizes Fungi, Chromista and several algal groups as independent of Plantae, the schedules required pragmatic accommodation within existing notational limits. Updated phylogenetic frameworks were integrated where possible, while span classes and information notes were used to manage scientific instability and kingdom-level disputes.

Stages five and six introduce a conceptual bifurcation in the treatment of microorganisms and viruses. The previous conflation of morphological, physiological and systematic criteria within single hierarchies is replaced by a dual structure: one table preserving clinically relevant morphological classifications (e.g., Gram staining, host-based grouping), and a separate systematic table grounded in contemporary taxonomic consensus (e.g., Bergey's Manual for Bacteria; ICTV and Baltimore classifications for Viruses). This separation resolves structural incoherence while maintaining practical utility for diverse user communities.

Across all stages, the project adopts consistent presentation principles: Latin scientific nomenclature as primary form; explicit qualifiers for extinct and scientifically outdated taxa; extensive use of including, scope and information notes; and systematic recording of concept movement within the UDC Master Reference File (MRF). Particular attention is given to the tension between rapid scientific transformation and the infrastructural need for classificatory continuity.

The revision demonstrates that maintaining a universal documentary classification in biology is not a matter of mirroring every phylogenetic shift, but of constructing stable semantic frameworks capable of metabolizing scientific change. The Biology Revision Project thus exemplifies structural stewardship within a global knowledge organization system operating under conditions of epistemic volatility.

This article examines the adequacy of contemporary classification schemes — particularly the Universal Decimal Classification (UDC) — for representing Indigenous realities in Latin America. It argues that widely used bibliographic classifications, constructed within European epistemological frameworks, often function as restrictive structures that marginalize or distort Indigenous concepts, categories, and knowledge systems.

The text documents a multi-stage project aimed at addressing these limitations through the translation of the UDC Summary into three Indigenous languages: Quechua (Runasimi), Guaraní (Ava-Ñe'ẽ), and Mapuche (Mapudungun). The initial translation effort revealed significant lexical gaps, reliance on neologisms derived from Spanish or Portuguese, and the structural inadequacy of simply rendering Western classificatory vocabulary into Indigenous languages. The project therefore evolved into a second stage focused on enriching the existing structure with Indigenous cultural elements, vocabulary, and explanatory notes, while preserving internal coherence and operability. A third stage involved identifying structural mismatches between Western classificatory frameworks and Indigenous worldviews, and developing guidelines for handling documents that do not fit neatly within dominant epistemic models.

The article concludes that translation alone cannot produce culturally inclusive indexing languages. Instead, systematic analysis of worldview differences, explicit acknowledgment of structural limitations, and the development of alternative classificatory pathways are necessary. The work positions classification as an epistemic infrastructure that must be critically examined and adaptively re-engineered to accommodate plural knowledge systems.

This paper reports on the second stage of the UDC Biology Revision Project, focusing on the comprehensive revision of Class 582 (Systematic botany) within the Universal Decimal Classification (UDC). Following the 2010 revision of vertebrate zoology, this stage addresses long-standing structural and terminological obsolescence in botanical classification, previously based on outdated taxonomic systems resembling Cronquist's framework.

The revised schedule adopts the Angiosperm Phylogeny Group III (APG III) system as its primary scientific reference, incorporating molecular phylogenetic evidence into the organization of flowering plants and restructuring higher-level taxa accordingly. Numerous deprecated classes were cancelled or relocated, new groupings were introduced, and taxonomic hierarchies were reorganized to reflect contemporary botanical consensus. Living and extinct plants are presented in a unified sequence, replacing earlier parallel divisions with a colon-combination approach for palaeobotanical expression.

The revision formalizes caption presentation rules that prioritize internationally standardized Latin scientific names, with common names included parenthetically when useful. Expanded including, scope, and information notes provide enhanced terminological access while preserving structural clarity and notation stability. The resulting schedule significantly increases granularity, particularly at genus and species level, supporting improved indexing in botany and related applied domains such as agriculture and industry.

This stage establishes a consistent editorial model for subsequent revisions of biological systematics in UDC, aligning documentary structure with contemporary plant taxonomy while minimizing disruption to existing classification practice.

This paper presents an initial investigation and comprehensive revision proposal for class =4 (Afro-Asiatic, Nilo-Saharan, Niger-Congo, and Khoisan languages) within Table 1c (Common auxiliaries of language) of the Universal Decimal Classification (UDC). Although the language auxiliaries underwent substantial restructuring in the early 1990s, subsequent developments in African linguistics have rendered parts of the schedule outdated or structurally inconsistent with current scholarship.

The proposal undertakes a systematic review of major African language families in light of contemporary classificatory research, including reassessment of genealogical groupings, hierarchical arrangements, and inter-family relationships. Structural modifications include the reorganization of Afro-Asiatic subdivisions, reclassification within Nilo-Saharan, the restructuring of Niger-Congo arrays (including the separation of Mande and Dogon as independent families), and the reconsideration of Khoisan as a container term rather than a genetically unified group. The revision also introduces controlled updates to nomenclature, replaces derogatory or obsolete designations, incorporates standardized orthographies, and adds new or previously underrepresented languages while maintaining number stability wherever possible.

Particular care is taken to preserve the internal architectural coherence of the UDC and to avoid unnecessary reuse of cancelled numbers, providing precise redirection notes to ensure database continuity. The paper frames classification revision as an ongoing process requiring alignment between documentary systems and advances in linguistic science. It invites expert feedback as part of a broader effort to establish a sustainable and consensual organization of African indigenous languages within a global classification framework.

This paper presents the first stage of the UDC Biology Revision Project, focusing on the comprehensive revision of Class 59 (Vertebrates) within the Universal Decimal Classification (UDC). The project aims to update and realign the systematic sections of zoology, botany, microbiology, and virology with contemporary biological taxonomy while preserving the architectural stability of the classification scheme.

The article begins by outlining the principal models of biological systematics, contrasting Linnaean rank-based taxonomy with cladistic approaches, and explaining their implications for documentary organization. While maintaining the Linnaean hierarchical framework as the structural backbone of UDC, selected non-controversial elements of phylogenetic systematics are incorporated to improve conceptual alignment with current scientific practice.

A detailed analysis of pre-revision problems is provided, including outdated structures, obsolete or incorrect terminology, misplaced taxa, duplication between palaeontological and zoological schedules, and artificial disciplinary separations between extinct and extant organisms. The revision addresses these issues through controlled structural reorganization, unification of living and extinct vertebrates within a single schedule, careful management of notation cancellation and relocation, and the introduction of systematic editorial conventions for captions and notes.

The paper establishes methodological guidelines for future stages of the Biology Revision Project, including principles for notation stability, treatment of taxonomic ranks, use of Latin nomenclature, deployment of including and scope notes, and database-level documentation practices. The revised Class 59 thus serves both as a corrected systematic table and as a model for sustainable, scientifically grounded revision of biological knowledge organization within UDC.

This article examines the presence of ideologically charged and discriminatory descriptors within documentary languages, focusing on classification systems such as the Universal Decimal Classification (UDC). After outlining the artificial and controlled nature of documentary vocabularies, the text argues that such systems, far from being neutral, inevitably reflect the dominant ideologies of the societies that produce them. Particular attention is given to ethnic and racial auxiliary tables within the UDC, where descriptors such as "colonial races and peoples" and "primitive peoples" reveal embedded hierarchies and negative connotations.

The article analyzes how these classifications perpetuate asymmetries by naturalizing historically contingent and politically loaded categories, and how such terminology is disseminated through bibliographic infrastructures as if it were objective. It further documents the author’s intervention within the UDC Revision Advisory Committee, which led to the elimination and restructuring of several problematic descriptors in the 2005 edition of Extensions and Revisions. Beyond critique, the text proposes a methodological framework for the systematic identification, analysis, and revision of ideologically biased terms within documentary systems. The work frames classification not as a neutral technical tool, but as an epistemic mechanism requiring continuous interdisciplinary and multicultural scrutiny.

This document presents an overview of the principal changes incorporated into the 2015 Spanish edition of the Universal Decimal Classification (UDC), published by AENOR and synchronized with updates in the Master Reference File (MRF). The report summarizes structural, terminological, and editorial modifications accumulated since the previous complete Spanish edition (2000), reflecting fifteen years of systematic revision at international level.

Among the most significant developments are the expansion of geographical auxiliaries (Table 1e), substantial revision and enlargement of linguistic auxiliaries (Table 1c) — particularly African and Indigenous American languages — cancellation and restructuring of common auxiliaries of viewpoint, creation of new auxiliary tables for relations and processes, and the elimination of parallel subdivision in favor of colon combination. Major systematic classes underwent extensive reorganization, including Religion (re-faceted to ensure equal structural treatment of religious systems), Paleontology (fully reformulated and integrated with systematic botany and zoology), Cultural Anthropology, Mathematics, Physics, Demography, Education, and Architecture. The revision also introduced new domains, such as Class 60 - Biotechnology.

Beyond enumerating updates, the text documents an ongoing effort to remove discriminatory terminology, clarify editorial notes, modernize hierarchical structures, and align the Spanish edition with international scientific and conceptual standards. The report situates the 2015 edition as a transitional moment in the continued modernization of UDC as a dynamic and internationally governed knowledge organization system.

This document presents the Universal Decimal Classification (UDC) Summary in Spanish, providing a structured overview of the scheme’s main classes and their hierarchical organization. Designed as an accessible reference tool, the text enables Spanish-speaking users to navigate the top-level architecture of UDC without requiring access to the full Master Reference File (MRF) or licensed editions.

The work functions as both a practical instrument and a pedagogical resource. By translating and systematizing the Summary schedules, it facilitates orientation within the decimal structure, supports training activities, and assists institutions operating with limited access to complete UDC documentation. The text also reflects the importance of linguistic mediation in knowledge organization systems: classification access is not neutral when language barriers shape usability.

While not a revision proposal or theoretical intervention, this contribution strengthens the infrastructural layer of UDC by expanding its accessibility and operational clarity within the Spanish-speaking professional community.

This document presents the Universal Decimal Classification (UDC) Summary translated into Galician, offering a structured overview of the scheme's principal classes and hierarchical organization in a minority European language. The text functions as a practical reference instrument, enabling orientation within the decimal architecture of UDC without requiring access to the complete licensed schedules.

Beyond its immediate utility for training and consultation, the translation underscores the importance of linguistic accessibility in knowledge organization systems. By rendering the Summary in Galician, the work expands professional access to classification tools in a regional language context and supports the normalization of technical terminology outside dominant international languages.

Although not a revision proposal or theoretical analysis, this contribution reinforces the infrastructural dimension of classification practice, demonstrating how linguistic mediation shapes the usability and inclusiveness of global documentary systems.

This text introduces and explains the Master Reference File (MRF), the central database underpinning the Universal Decimal Classification (UDC). The MRF stores not only the current classification schedules, notes, and examples of combination, but also editorial annotations, concept histories, and records of cancellations and modifications, enabling systematic tracking of conceptual evolution within the scheme.

The article outlines the role of the UDC Consortium in maintaining and licensing the database, and describes the mechanisms through which annual revisions — additions, corrections, and cancellations — are incorporated and distributed to license holders. Particular attention is given to the technological modernization of the MRF, including its migration to a MySQL environment, the parallel maintenance of legacy formats, and the conversion of data to Unicode (UTF-8) to ensure character integrity across languages and editions.

By clarifying the structure, governance, and technical evolution of the MRF, the text situates classification as a living database rather than a static printed schedule. It highlights the importance of version control, data integrity, and structured editorial workflows in sustaining a global knowledge organization system.

This text examines the structural role of languages within the Universal Decimal Classification (UDC), emphasizing their function as a central facet in knowledge organization. Linguistic auxiliaries (Table 1c) underpin not only the class "Linguistics" (81) and national literatures (82), but also the categorization of ethnic groups and the identification of the language of documents across the entire scheme. For this reason, the organization and revision of language tables have far-reaching implications within the UDC architecture.

The article reviews the historical overhaul of linguistic auxiliaries in the late twentieth century and details subsequent targeted revisions, particularly concerning Indigenous languages of the Americas and Africa. These revisions addressed outdated classifications, hierarchical inconsistencies, and the persistence of colonial or derogatory terminology. Structural corrections included the redefinition of language families, incorporation of contemporary linguistic scholarship, addition of glotonyms (self-designations), and expansion of underrepresented linguistic groups.

The text also demonstrates how language notations operate generatively within the UDC system: a linguistic auxiliary can produce corresponding notations for ethnic identity, linguistic description, and literature in that language. Through concrete examples drawn from South American classifications, the article illustrates how improved linguistic representation enhances documentary precision and reduces eurocentric bias. The revision of language tables is thus framed not only as technical updating, but as an epistemic intervention in multilingual and multicultural knowledge infrastructures.

This text provides a comprehensive overview of the uses and internal architecture of the Universal Decimal Classification (UDC), combining practical application guidance with structural analysis. It begins by challenging common stereotypes that reduce UDC to a shelving tool for libraries, demonstrating instead its versatility across physical and digital collections, museums, indexing services, thesaurus construction, metadata mapping, and international information exchange.

The article then outlines the fundamental structural components of the scheme, distinguishing between main tables and auxiliary tables and explaining the faceted logic that enables synthetic number construction. Detailed attention is given to common and special auxiliaries, their symbolic indicators, and their combinatory potential in expressing place, language, form, time, ethnic identity, processes, and properties.

A substantial portion of the text is devoted to the syntactic mechanisms that govern number construction, including coordination (+), extension (/), simple and fixed relation (: and ::), subgrouping with brackets, and span classes. The conceptual differences between compound and complex numbers are clarified, with emphasis on semantic precision and shelving implications. The article also examines editorial maintenance tools such as parallel subdivision, cancellation procedures, redirection practices, and the "ten years rule," explaining how conceptual evolution within scientific and cultural domains necessitates systematic restructuring of classification schedules.

By articulating both structural principles and maintenance mechanisms, the text presents UDC as a dynamic, faceted, and syntactically sophisticated knowledge organization system whose flexibility depends on rigorous internal rules and continuous editorial oversight.

This text examines the institutional governance and editorial processes underlying the Universal Decimal Classification (UDC). Beginning with the historical origins of the scheme in the bibliographic project of Paul Otlet and Henri La Fontaine, the article traces the evolution of its managing bodies — from the Institut International de Bibliographie and the Federation Internationale de Documentation (FID) to the current UDC Consortium (UDCC).

The structure and responsibilities of the Consortium are outlined in detail, including maintenance of the Master Reference File (MRF), licensing and publication policies, and the role of Extensions and Corrections to the UDC (E&C) as the formal channel for communicating revisions. Particular attention is given to the division between executive and editorial functions and to the composition of the Editorial Team, including associate editors and external advisory specialists.

The article further clarifies the procedural pathway through which classification content is created and revised. While users may initiate proposals and signal conceptual gaps or problematic terminology, the transformation of suggestions into formal schedules requires systematic research, terminological normalization, structural integration, peer review, and editorial documentation before final incorporation into the MRF. By detailing these mechanisms, the text presents UDC not as a static classification scheme, but as a collaboratively maintained and continuously evolving knowledge infrastructure governed by formal institutional processes.

This article presents a comprehensive proposal for the revision of the section devoted to South American Indigenous languages within Table 1c (Common auxiliaries of language) of the Universal Decimal Classification (UDC). The existing structure is shown to provide limited and uneven representation of the linguistic diversity of the continent, reflecting outdated or insufficiently detailed classifications. In response, the proposal redesigns the schedule to accommodate a substantially broader range of languages and language families, while preserving the overall architectural logic of the UDC.

The revised structure is grounded in contemporary linguistic, anthropological, and sociological research, drawing upon major ethnolinguistic classifications and specialized regional studies. More than two hundred languages are reorganized according to updated family groupings and cultural-geographical frameworks. Particular attention is given to the inclusion of auto-denominations (self-designations) alongside widely used exonyms, acknowledging the importance of respectful and accurate representation within documentary systems.

Beyond technical expansion, the proposal addresses the epistemic responsibility of classification tools in multilingual and multicultural contexts. It demonstrates how systematic revision can improve precision, inclusiveness, and structural coherence without disrupting the internal consistency of the classification scheme. The work represents a large-scale intervention aimed at aligning documentary language with contemporary scholarship and the plural realities of South American linguistic heritage.

This article analyzes the persistence of evolutionist and colonial ideologies within contemporary documentary languages. After situating the emergence of cultural anthropology within the imperial and evolutionist frameworks of the eighteenth and nineteenth centuries, the text examines how hierarchical categories such as "primitive," "developing," and "civilized" peoples were historically constructed and naturalized within Western thought. Although such frameworks have been critically dismantled within anthropology, their conceptual residues remain embedded in certain documentary classification systems.

Focusing on auxiliary tables of the Universal Decimal Classification (UDC), the article demonstrates how descriptors such as "primitive peoples," "highly developed peoples," and "colonial races and peoples" reproduce evolutionist hierarchies under the guise of controlled vocabulary. The analysis challenges the assumption of ideological neutrality in documental languages, arguing that the deliberate selection of descriptors constitutes an epistemic act shaped by dominant worldviews. The article calls for interdisciplinary and multicultural oversight mechanisms capable of identifying and revising ideologically charged terminology. It also documents the subsequent cancellation and restructuring of the cited descriptors within the 2005 edition of Extensions and Revisions, reframing colonialism and development as political and economic categories rather than racial classifications.