[NTG-context] setupregister/placeregister

[Alan Braslau]

Hello,

The criterium key in setupregister (so placeregister, placeindex, ...)
takes the following values:
criterium	local text current previous all section

all: places all entries of the document
section: (part, chapter, section, ...) places entries associated with
that structure element.

Can someone explain local, text, current, previous
for their scope and perhaps subtle differences are not entirely obvious
to me.

Thank you

Alan