Worked on the UBS_M1_TEI repository to enhance Les Caractères.xml by enriching metadata, expanding bibliographic entries, and introducing semantic tagging. Applied advanced data structuring techniques using TEI and XML to refine publisher, edition, and publication identifiers, as well as to add and update source descriptions. Integrated new semantic elements to represent both persons and philosophical concepts, linking them to relevant entities within the text. Focused on improving cross-referencing and internal document structure, which supports better data quality and discoverability. The work enabled more robust searchability and downstream analytics for bibliographic metadata, reflecting a deep understanding of TEI/XML modeling.