Eliot,

 

From RFC3405:  "Also note that there could have been an additional first step where

the URN was resolved as a generic URI by looking up urn.uri.arpa.

The resulting rule would have specified that the NID be extracted

from the URN and '.urn.arpa.' appended to it resulting in the new key

'foo.urn.arpa.' which is the first step from above."

 

From the Abstract of every DDDS document:  3401-3405  "It is very important to note that it is impossible to read and understand any document in this series without reading the others."