Thanks for the comments, Rick. I'll make some changes based on this
feedbacxk.

 - When it comes to using osgDB, I have noticed some use of an underlying
database.  Perhaps something that caches files that are read so that if the
code asks for the same file again, it will not have to read it again.  Is
that true?  I think the viewer part actually talks about the database pager.
Is that what that is?  

Good question. My intent in the QSG is to present file I/O as simply as
possible. This means the QSG doesn't go into detail about onfiguring the
osgDB to cache loaded files.
 
The osgDB's Registry class keeps track of plugins and loaded data. This is a
separate database from that referred to by the DatabasePager, which is a
component of osgDB that manages paging portions of a visual database in &
out of memory.
   -Paul
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