NONE 20260316093033755 wseas/wseas content-registration-form+ja@crossref.org content-registration-form WSEAS TRANSACTIONS ON COMPUTERS 1109-2750 2224-2872 Evangelia N. Petraki Department of Economics National and Kapodistrian University of Athens Athens, GREECE The massive collection of data that has been taking place in recent years, in multiple ways and at an unimaginably fast pace, has led to the need to store and retrieve information from both structured and semi-structured or unstructured data. While the relational database model is widely used and provides efficient ways to organize structured data, manage it, and search for information through SQL commands, it has limitations and is not a suitable model for organizing and storing semi-structured data or data that lacks structure. This paper briefly presents the FDB model, a NoSQL database model that provides flexibility in defining any database schema, overcomes the limitations of the relational database model, while at the same time offering the possibility of multilingual conceptual searches in the database data, utilizing the information derived from multilingual thesauri. This paper presents the architecture of the FDB model, the thesaurus management and conceptual search algorithms, the process of converting a relational database schema to the corresponding FDB database schema, the advantages of the model, the ability to host semi-structured databases, as well as conclusions and future directions. 12 31 2025 12 31 2025 248 26 https://creativecommons.org/licenses/by/4.0/deed.en_US 10.37394/23205.2025.24.26 https://wseas.com/journals/computers/2025/a525105-025(2025).pdf H. Basim Alwan, K.R. 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