Abstract
Initially, relational model of data has been specified by E. F. Codd with the naming conventions to the attributes called “relationship”. It is something between relations and tables, i.e., between implementation and user view on data. In this paper, ideas for “relationship” are formally specified in Z-notation. The last one is an ISO standard now. The purpose of this paper is to reinvestigate ideas behind the “relationships” in a more formal way. This approach is useful for further research in extending relation model of data to capture multimedia data and data streams, which are, usually, generated by different kinds of sensors.
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