I figured out how sections are referenced -- by specifying a section at the end of an include statement:
include "fileName" section=sectionName
My guess is that this filters in, everything enclosed by
section sectionName
endsection sectionName
What I've not found is how libraries are being referenced. By libraries I mean parts of an include file enclosed in
library libraryName
endlibrary libraryName
And there is still the little matter of nested sections or libraries. Is this legal? Can only the outermost section/library be referenced (peeled away)?