Try the xml-imagery-bounds plugin, I wrote it especially for that :)
Right click on a polygon, and it shows you the XML code :)
You can also download the Maps contents to edit an existing imagery
boundary:
http://wiki.openstreetmap.org/wiki/JOSM/Plugins/Imagery-XML-Bounds
2012/9/5 Paul Norman
>
I've been thinking of cleaning up some of the entries for the
sources in https://josm.openstreetmap.de/wiki/Maps so that I don't get US
imagery suggested in areas without coverage.
Is anyone aware of a tool that will convert from .osm, .poly or WKT to the
XML used by JOSM?
I could convert it by