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The aim of this study is to provide a critical analysis of the representation of sexual orientation in the Portuguese Universal Decimal Classification, grounded in a qualitative content analysis method. The results show that the principle of exhaustiveness does not manifest itself in the representation of sexual orientation. The absence of the term \u2018heterosexuality\u2019 mirrors the heteronormative hegemony, while the minoritization of \u2018lesbianism\u2019, but not of \u2018male homosexuality\u2019, reflects the patriarchal hegemony. The representation of sexual orientation carries the historical pathologization of sexual orientations other than heterosexuality. The Portuguese Universal Decimal Classification conveys negative biases and misrepresents sexual orientation in a way that is irreconcilable with present-day reality. Critical thinking must be encouraged within the library community and the Universal Decimal Classification should be promptly revised and updated.<\/jats:p>","DOI":"10.1177\/03400352231205712","type":"journal-article","created":{"date-parts":[[2024,1,24]],"date-time":"2024-01-24T08:41:20Z","timestamp":1706085680000},"page":"108-117","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["Prejudice but no pride: The Portuguese Universal Decimal Classification\u2019s labelling of sexual orientation"],"prefix":"10.1177","volume":"50","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7488-592X","authenticated-orcid":false,"given":"Paulo","family":"Vicente","sequence":"first","affiliation":[{"name":"University of Coimbra, Faculty of Arts and Humanities, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1292-2849","authenticated-orcid":false,"given":"Ana L\u00facia","family":"Terra","sequence":"additional","affiliation":[{"name":"University of Coimbra, CEIS20 \u2013 Centre for Interdisciplinary Studies, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8849-8792","authenticated-orcid":false,"given":"Maria Cristina Vieira","family":"de Freitas","sequence":"additional","affiliation":[{"name":"University of Coimbra, CEIS20 \u2013 Centre for Interdisciplinary Studies, Portugal"}]},{"given":"Maria Manuela Tavares","family":"de Matos Cardoso","sequence":"additional","affiliation":[{"name":"University of Coimbra, CEIS20 \u2013 Centre for Interdisciplinary Studies, Portugal"}]}],"member":"179","published-online":{"date-parts":[[2024,1,24]]},"reference":[{"key":"bibr1-03400352231205712","doi-asserted-by":"publisher","DOI":"10.7560\/JHS24306"},{"key":"bibr2-03400352231205712","doi-asserted-by":"publisher","DOI":"10.1353\/lib.2018.0025"},{"key":"bibr3-03400352231205712","volume-title":"CDU: Classifica\u00e7\u00e3o Decimal Universal: Tabela de autoridade","author":"Almeida AC","year":"2005"},{"key":"bibr4-03400352231205712","doi-asserted-by":"publisher","DOI":"10.7551\/mitpress\/6352.001.0001"},{"key":"bibr5-03400352231205712","doi-asserted-by":"publisher","DOI":"10.5771\/0943-7444-2020-5-393"},{"issue":"3","key":"bibr6-03400352231205712","first-page":"122","volume":"27","author":"Campbell G","year":"2000","journal-title":"Knowledge Organization"},{"key":"bibr7-03400352231205712","doi-asserted-by":"publisher","DOI":"10.5771\/0943-7444-2008-4-229"},{"key":"bibr8-03400352231205712","doi-asserted-by":"publisher","DOI":"10.7152\/acro.v29i1.15461"},{"key":"bibr9-03400352231205712","doi-asserted-by":"publisher","DOI":"10.5771\/9783956507762-98"},{"key":"bibr10-03400352231205712","doi-asserted-by":"crossref","first-page":"112","DOI":"10.4267\/2042\/51563","volume":"66","author":"Courbi\u00e8res C","year":"2013","journal-title":"Herm\u00e8s, La Revue"},{"key":"bibr11-03400352231205712","doi-asserted-by":"publisher","DOI":"10.21728\/logeion.2019v5n2.p86-120"},{"key":"bibr12-03400352231205712","unstructured":"Digital Transgender Archive (n.d.) 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