[Ecrit] Generalizing draft-george-ecrit-lamp-post

[Richard Barnes <[e-mail]>]

It seems like this draft is a little specific to a particular use- 
case.  As several people mentioned in Anaheim, there are lots of  
things around that have numbers on them -- from lamp-posts, mile- 
posts, utility poles, bridges, etc.  If you were going to be  
inclusive, you might include all the QR codes that Google has been  
putting up as well.

So to avoid having to define new CAtypes for every "numbered thing  
that can be a location indicator", could I suggest that we make the  
following generalization?

1. Add a single "place number" ("PLN"?) CAtype with two child nodes:
1.1. A "type" to indicate what type of numbered object is being  
referred to
1.2. The number of the referenced object

2. Add a first-come-first-served registry of type values