Over the past week there has been a very long and detailed conservation about tagging parks and conservation land on the talk-us email list. This is a topic of great interest to me, but, the emails have reminded me of the fact that attempting to model everything on earth as an XML file is ultimately futile. Happily, this contradiction built into the OSM seems to insure that the project stays alive and vital over the long term. There is always room for improvement, the map can't ever be completed. The XML file is never going to be 100% right.