Hi,
I think the tags need to be looked at seriously and amended: for example "
fortification=ring_ditch" ring ditches are not known to be fortifications;
see
http://webgis.archaeology.ie/NationalMonuments/WebServiceQuery/Lookup.aspx
for terms
"doubled-ringed ringfort" these are called"bivallate
Hi,
There was a discussion of this last week. I've done a summary of related tags
as they are currently in use in Ireland / Northern Ireland. It's an extract
from http://stat.latlon.org/ie/latest/
While they might not have huge currency, they are a perfectly mapable feature.
Colm
