Hi,

as I wrote some time ago on this mailing list, I uploaded metamath as an
official package in Debian (it is currently in the development version
of Debian, and it will released when the new version of Debian will be
released; but in the meantime I see it has already been released with
Ubuntu 20.04 LTS Focal).

I now want to include some example databases too, in a package called
"metamath-databases". I see that set.mm, iset.mm and nf.mm are
maintained in [1], which can be probably considered their canonical
location (using branch "develop").

 [1] https://github.com/metamath/set.mm

For other databases mentioned by the Metamath readme (hol.mm, ql.mm,
demo0.mm, miu.mm, big-unifier.mm and peano.mm), it seems that they can
be downloaded at the URL

  http://us.metamath.org/metamath/NAME.mm

Can this be considered the canonical location where to fetch the most
updated version, or is there anything better?

Also, I would like to note that:

 * the files big-unifier.mm, demo0.mm, hol.mm, miu.mm and ql.mm are
placed in the public domain using the Creative Commons Public Domain
Dedication (http://creativecommons.org/licenses/publicdomain/). The
linked web page notes that that tool has been retired and its usage is
now discouraged. It is suggested to port them to CC0, which is what
set.mm and iset.mm are currently using. I would ask to Norm and Mario,
if they agree, to switch to the new tool, so that the databases' legal
status is clearer.

 * nf.mm does not have any copyright or licensing indication. Or, at
least, I cannot find any. Could its status be cleared, so that it is
possible to distribute it without concerns?

Thanks for your help, Giovanni.
-- 
Giovanni Mascellani <[email protected]>
Postdoc researcher - Université Libre de Bruxelles

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