Semantics of header entries

Since headers are needed for equations to be parsed, and (at least in theory) equations can come from multiple simultaneous sources, there will be a need for multiple simultaneous headers, which should simply be unioned together, no? This means that one should be able to load the same library multiple times and declare the same dimension multiple times, and so on. What is necessary is that everything be consistent, e.g., an operator cannot be defined to have multiple interpretations.

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