parking:condition=* — describes the legal properties of the parking;
source:geometry=* or source:position=* — to point a source, like GNSS / survey / extrapolation / common knowledge / local knowledge (see source=* for more information). Also: add fixme=position estimated to your entry, so the next mapper will check the coordinates (from OSM for the blind).
RU:Lacking proper attribution/Example email — письмо может использоваться в качестве шаблона, если вы увидели, что данные OSM размещены где-либо без соответствующего цитирования или с нарушением лицензии
My jabber: vazhnov@jabber.org, vazhnov@xabber.org.
Public domain
All my contributions to OpenStreetMap are released into the public domain. This applies worldwide. In case this is not legally possible, I grant anyone the right to use my contributions for any purpose, without any conditions, unless such conditions are required by law.