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> > With attribute handling I mean pin mapping, BOM generation and similar which is handled thru attached attributes. I think gschem use non of the attributes itself, just assign and display which work great.
> 
> Yes but to be fair slotting has it's issues.

Attribute for pin may be changed from layout in pcb or assigned later in workflow. This is a feedback issue and attribute is not interpreted by gschem.

If gschem assign pinnumber which I think slotting mechansim do, it must interpret the attributes and define rules for them. There is a problem because same symbol may be used at different positions for different packages and package may not be known or changed afterwards. I think point to mapping with attribute or embedded would or have solved it. Not all circuits end up on a circuit board and for these package pin numbers may not make any sense and better removed.

This pin mapping selection is also a problem for some circuits available in different packages.

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