Ismail, R. , Makhtar, M. , Hasan, H. , Mamat, A.R. and Patria, L. 2025. Ontology Model for Hajj using Ontology Development 101 Methodology. Journal of Advanced Research Design. 141, 1 (Aug. 2025), 241–256. DOI:https://doi.org/10.37934/ard.141.1.241256.