June 2010
Intermediate to advanced
328 pages
7h 51m
English
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Objective: Support Variable Attributes
Extensibility is frequently a goal of software projects. We would like to design software that can adapt fluidly to future usage with little or no additional programming.
This is not a new problem; similar arguments against the inflexibility of relational database metadata have been made almost continuously since 1970, when the relational model was first proposed in A Relational Model of Data for Large Shared Data Banks [Cod70] by E. F. Codd.
A conventional table consists of attribute columns that are relevant for every row in the table, since every row represents an instance of a similar object. A different set of attributes represents a different type of object, so it belongs in a different table. ...
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