Value based calculating/calccache

The GeoDMS is controlled by a declarative scripting language, which is used to define data-values, and not variables with intermediary states. This helps to make the modelling logically transparent and results traceable.

There are still many changes that could affect the validity of calculated values, such as external data changes, changes of calculation rules and the introduction of new items or removal of existing items.

We will take time to think and write about a more rigorous approach to identify CalcCache entries, also how this relates to working more interactively with the GeoDMS GUI.

Related Mantis Issues: 1064

Vrije Universiteit
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