[Xastir] dbfawk questions

[Jason Winningham]

I'd like to make certain lines display differently depending on the 
display level.  When displaying state outlines, for example, I'd like 
to see a wide dotted gray line when close in (zoom level <= 1024), but 
display as a narrow solid black line when farther out.  Can a dbfawk do 
this and if so, how?

Can a dbfawk be used to stop the processing and display of a shapefile? 
  e.g.,  if the current zoom level is >1024, I don't want to display any 
TIGER shapefiles.  I know I can do this with map properties, I just 
wondered if dbfawk could, too.

Can I do a mathematical relation test instead of a regular expression?  
e.g., something like

/POPULATION<10000/ {display_level=256}

I tried this, but nothing happened.

I've been writing a dbfawk for the National Atlas "cities" shapefile, 
and found out that some very large cities like Nashville, TN and some 
very small places like Smoke Rise, AL are both in the same population 
range - "Undetermined".  Arrggghhhh!

At least it was a good dbfawk learning experience. (:

-Jason
kg4wsv