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The Third Manifesto introduced the relational language Tutorial D, and you use it for the examples in the new book. Do you think it has a future as an implementation or do you never intend it to be implemented

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Blender s default view looks decidedly 2D. The default square object is a cube, but it doesn t yet appear to be one on the screen. This is because although you re working in a 3D space, the default view in Blender is from directly above the canvas. (Unlike the GIMP or Inkscape, Blender doesn t use a paint and brush metaphor, so it calls the canvas a plane instead.) On the left side of the menu bar directly beneath the Blender workspace is a View menu. Click this menu with your mouse, and select Camera. The keyboard shortcut for this action is the zero key on the numerical keypad, over on the right side of most desktop keyboards. On a laptop, you may have to hold down a function key to access the numerical keypad. The workspace now switches to the kind of view you may have expected in a 3D graphics program (see Figure 6-5). A plane made up of gray squares stretches into the distance, like a tiled floor. Instead of a gray square in the center of the workspace, you now have a cube with a top and sides in different shades of gray. One side of the cube is shown as the darkest gray, but that doesn t necessarily mean it s in the shadow of the light source you look at lighting effects later in this chapter. The red and green arrows are supplemented by a third, blue arrow, pointing upward. At lower left in the main window, you can see the blue arrow labeled as the Z axis (the third dimension).

To use an assertion method, pass a string message and two parameters to compare. The string is the message to be used if the test fails.

Again I d like to clarify a couple of things up front First, I d like to explain what The Third Manifesto is The Third Manifesto is a formal proposal by Hugh Darwen and myself for the future of data and data management systems It s a fairly short document (maybe 12 pages); it s also pretty terse and, to be frank, not all that easy to understand So Hugh and I wrote a book of some 500 pages (!) to explain it The third edition of that book (title Databases, Types, and the Relational Model: The Third Manifesto) is due to be published late this year or early next year2 And the first confusion factor is that people often refer to that book, loosely, as The Third Manifesto but it really isn t; in fact, the Manifesto proper constitutes just one chapter in the book.

assertEquals("Error testing the application state", state, 1);

Now, in the Manifesto proper we I mean Hugh Darwen and myself use the name D generically to refer to any database language that conforms to the principles laid down in the Manifesto Note that there could be any number of distinct languages that all qualify as a valid D (Perhaps I should say explicitly in passing that SQL is not one of them!) And in the Manifesto book we introduce a particular D, which we call Tutorial D, that s meant to be used as (we hope) a self-explanatory basis for illustrating relational ideas self-explanatory in the sense that if you re familiar with any conventional programming language, you should have no difficulty in following it.

Figure 6-5. Switch the view to Camera mode, and the object in the Blender workspace begins to look 3D.

If you omit the message string, you'll get the default message. In the editor, type Assert, in order to see code hints for the available assertion methods in FlashBuilder IDE.

(I should mention in this connection that I ve previously used Tutorial D in several other books, as well as in live seminars, and my experience does tend to confirm that it s sufficiently self-explanatory for the purpose) However, Tutorial D is, in a sense, only a toy language; it has no I/O and no exceptionhandling and is incomplete in various other ways as well It follows that Tutorial D per se could never serve as a true industrial-strength language But that doesn t mean we don t want to see it implemented! We believe it could serve as an extremely useful vehicle for teaching and reinforcing relational concepts before students have to get their heads bent out of shape from having to learn SQL And as a matter of fact some implementations do exist; you can find details (including downloadable code) at the website http://wwwthethirdmanifestocom.