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We propose to use object-relational database management systems to store and manage semi-structured data. ORA-SS (Object-Relationship-Attribute model for Semi-Structured data)  is used as the data model. It not only reflects the nested structure of semi-structured data, but also distinguishes between object classes and relationship types, and between attributes of object classes and attributes of relationship types. ORA-SS can specify the degree of n-ary relationship types and indicate if andoi:10.1109/wise.2002.1181661 dblp:conf/wise/MoL02 fatcat:rimxfpegjvbubef2o6tsohwjhm