Actually there are several things going on.
In general the database I'm trying to define would include not only the 
actual net list (ie a mapping between nets and pins), but also all the PCB 
junk that goes on. 

The cyclic graph requires some type of mutability if I want to find the net 
that belongs to a node and also find the nodes that belong to a net, but I 
may have come up with something that works without mutability, which  I 
described a while ago 
here: 
http://stackoverflow.com/questions/4580865/how-can-one-create-cyclic-and-immutable-data-structures-in-clojure-without-ext/10242730#10242730
 
 .  I haven't done much with that since I wrote it, so I'm not sure it'll 
work well.

So far I'm overwhelmed at trying to think about how to capture all the 
features I've thought of.  I guess I just need to start small.



On Monday, August 11, 2014 7:58:02 AM UTC-7, Patrick Logan wrote:
>
> Space is one thing, but I would assume the net list should be able to 
> represent sequential logic, which implies a cyclic graph.

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