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Date:	Thu, 19 Jan 2017 06:00:50 +0100 (CET)
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Subject:	Re: [geda-user] [pcb] why no clearpoly on silk
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On Wed, 18 Jan 2017, Peter Clifton (petercjclifton AT googlemail DOT com) [via geda-user AT delorie DOT com] wrote:

>No, but it's one worth considering if it can be done in a way that preserves
>behaviour of existing files.
>
>I'd like to try to keep compatibility with pcb-rnd where we can, and there
>seems no real point in reinventing different ways to make the same
>improvements.

Thanks, I'm open to such cooperation too.

>      In pcb-rnd we have support for multiple board file formats. Our
>      native format is not pcb but lihata. We support pcb as we
>      support kicad's format. The native format supports all features,
>      but the non-native ones don't.
>
>
>Point me at the libhata docs at some point if you get a chance?

http://repo.hu/projects/lihata/

section 2 lists the docs. This is only about lihata, which is a separate 
project. The board format (the "schematics" of the lihata tree) we use in 
pcb-rnd has no docs yet.

>I guess one way might to have a test for version (or flag) that allows to
>know if the data inside the file is supposed to be correct or not.

Thanks, good point, especially about the flag! Independent of the current 
case: global feature bitfield, or in a tree-like file format per subtree 
format versioning or global file format versioning. Doesn't matter much as 
long as only one implementation reads the file, but might make a big 
difference if multiple programs use the same file but impelement different 
subset of features.

I haven't have to bump lihata board version yet, this would be the first 
time, so it's the best moment for me to consider this aspect.

Regards,

Igor2

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