I get a decidedly odd (or, at least, unexpected by me) result from this, based
on the example on the contextgarden page for definestartstop:
\starttext
\defineblank[ExtractDistance][3pt]
\definestartstop[Extract][
style=slanted,
before={\blank[ExtractDistance]
\setupnarrower[left=2in,right=1in]
\startnarrower[left,right]
\noindent},
after={\stopnarrower
\blank[ExtractDistance]
\indenting[next]}]
%Now the following commands are available: \startExtract and \stopExtract
\starttext
The extract from Knuth
\startExtract \input knuth \stopExtract
\stoptext
But now, blockquote is altered:
\startblockquote
\input lorem
\stopblockquote
But not narrower itself:
\startnarrower
\input lorem
\stopnarrower
\stoptext
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