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On Sun, Aug 02, 2015 at 02:52:06PM -0400, John Doty wrote:
> 
> On Aug 2, 2015, at 1:21 PM, karl AT aspodata DOT se wrote:
> 
> > John Doty:
> > ...
> >> Note that it is entirely possible to create distinct modules from
> >> overlapping sets of schematic pages.
> > 
> >> You can have an ab.sym with source=a.sch and source=b.sch
> > ...
> > 
> > Do you have two source attribs in the symbol, or do you have a
> > symbol ab.sym in the schematc a.sch, where the symbol have a 
> > source=b.sch attribute ?
> 
> Two source attribs in the symbol. Like slotdef, you can have as many source attribs as you need in a symbol. 

In my designs, I've never set the source attribute in the symbol, only
in the instances.

> This could be considered a design defect: how do you promote and override 
> this sort of attrib? 

I always had the impression that the attribute handling rules are too 
complex; it would be much simpler to say that all attributes are promoted 
and the symbol attributes are only sensible initial default values, which 
are always ignored when processing the schematics (generating a netlist 
being the most common example).

BTW, doesn't the net attribute have similar problems: many 74xx symbols
have net=VCC:14 (or 16, or 20) and net=GND:7 (or 8, or 10).

> Maybe these should be multi-line instead.

People using MS Windows like multi-line file names.

    Gabriel