VARKON Version 1.15 1997-10-16

### Explicit modeling

In VARKON's normal mode of operation the user has no direct access to the explicit result he is creating. All operations are done on the generic model and VARKON updates the GM database automatically.
There are situations though where it is essential to be able to work on the explicit model directly and for this situation VARKON has an explicit mode of operation as well (the -r option). In explicit mode VARKON acts very much like a traditional CAD-system with all the danger and restriction that this implies.
You can create the same things in explicit mode as in generic mode, even call a MODULE with parameters to create a part but you can never go back, make changes and get everything updated automatically. Local changes are possible though. You may for example change the value of any parameters of a part but VARKON will only update the changed part and not the entire model as would be the case in generic mode.
Explicit modeling relates to generic modeling in much the same way as for example Microsoft's Word relates to Excel. In word-processing the result is what you see on the screen and there are no relations or dependencies between different parts of the text. This gives you total freedom to make any changes you want.
In Excel you don't have this freedom since different figures in the text may be related to each other through mathematical expressions etc. In Excel there is a (generic) model that describes the operations necessary to compute the result and if you change a figure in the text all dependent figures are changed automatically.

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