Science Fair Project Encyclopedia
The Third Manifesto
The Third Manifesto (1995) is Christopher J. Date's and Hugh Darwen's proposal for future relational database management systems that would avoid 'impedance mismatch' between object-oriented programming languages and RDBMSs by fully supporting all the capabilities of the relational model.
The main objective of The Third Manifesto, besides being theoretically sound and avoiding arbitrary restrictions and pragmatic debasement of the relational model, is to make a simple, restricted and precise definition of the role of object orientation in database management systems emphasising the few valid ideas from object modeling that are orthogonal to relational modeling. One of the major tasks has been to illustrate ways in which SQL represents an inadequate reflection of the relational model.
- Alphora Dataphor, a commercial product which implements the language atop SQL databases
- Rel, an Open Source implementation in Java
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