10.34622/datarepositorium/XVUB9L Miguel Ferreira0000-0002-8626-6082(Keep Solutions)Baptista, Ana Alice0000-0003-3525-0619(Universidade do Minho) Repositório de Dados da Universidade do Minho 2025 This Schema was created by the University of Minho, Department of Information Systems for the Controlled-vocabulary Add-on of the HP/MIT's DSpace. Original file: https://github.com/DSpace/DSpace/blob/main/dspace/config/controlled-vocabularies/controlledvocabulary.xsd. This XML schema was also used to encode the 1998 version of the ACM Computing Classification System available on the ACM website until it issued the 2012 version, encoded in SKOS. The file is now available at https://www.acm.org/binaries/content/assets/publications/computing-classification-system/1998/ccs98.xml. For more information regarding this schema, please contact the authors: Miguel Ferreira mferreira[@]keep.pt and Ana Alice Baptista analice[@]dsi.uminho.pt. Baptista, Ana Alice(Universidade do Minho)