[OSM-newbies] Market vs supermarket

[Someoneelse]

Xan wrote:

> What's the difference among that?
> I'm a newbee yet ;-)

Purely from an "English English" language perspective, "marketplace" 
tends to refer to the physical location where traders can gather to sell 
things; "market" can refer to either that or the event of people 
gathering together - in some English towns, Tuesday might be "market 
day" (like your "avui hi ha mercat" example), when traders set up stalls 
in a town centre to sell things.  The area would be be a marketplace all 
the time but there's only a market (in the second sense) there once a week.

I believe (but someone may correct me) that in American English "market" 
is also used to describe a shop that sells goods that you might also buy 
at a market (such as an "English English" grocer or greengrocer might 
sell).  I've no idea about the use in other places where versions of 
English are spoken (Australia, Scotland, South Africa, etc.).

The first two examples that I find of each of these in a local .osm file 
that I have to hand are these:

http://www.openstreetmap.org/browse/node/4118123
http://www.openstreetmap.org/browse/node/14733611

and they pretty much describe the same sort of thing.  If it was me 
adding one of these, I'd use "amenity=marketplace" because it doesn't 
have the secondary American meaning that "market" does.  There's no 
right or wrong answer though.  It also got discussed here:
http://wiki.openstreetmap.org/wiki/Approved_features/Marketplace
and no dissenting voices were raised.