NESTED RELATIONAL DATA MODEL

摘要

A data base system (100) handles nested relational data model (NRDM) data. A metadata mapper (104) converts DTD w/hierarchical structures (102) to NRDM schema that are then stored in schema storage (106). A document (110) is passed to an importer (112), then to a transformation engine (114) and an exporter (116) to result in a document in a new format (118). Because the transformation engine (114) operates on NRDM structures, the transformations can be expressed as a declarative specification, thus simplifying the process of transforming complex data. Exporter (116) exports the data in a suitable form such as XML documents, relational tables or flat files.