1. McHugh J, Abiteboul S, Goldman R, Quass D, Widom J (1997) Lore: a database management system for semistructured data. SIGMOD Record 26(3):54–66
2. Novotny T (2007) A content-oriented data model for semi-structured data. Dateso p 5566
3. Giacomo DG, Lenzerini M (1997) A uniform framework for concept definitions in description logics. J Artif Intell Res, AI Access Foundation and Morgan Kaufman, pp 87–110
4. Calvanese D, Giacomo DG, Lenzerini M (2007) Extending semi-structured data. In: 4th asia-pacific conference on conceptual modeling. vol 67, Australia, pp 11–14
5. Magnani M, Montesi D (2004) Dimensions of ignorance in a semi-structured data model. In: IEEE 15th international workshop on database and expert systems applications, pp 933–937