Using a recent MkIV beta (2014.03.27), it seems that a page reference to
a figure fails if the figure location is "none." Here is a minimal
example:
\starttext
\input knuth
\placefigure[none][regularref]{}{\pagereference[workaroundref]
\externalfigure[cow.pdf]}
\input knuth
See \at{page}[workaroundref] or \at{page}[regularref]
\stoptext
The log file has
references > unknown reference '[][regularref]'
and the .pdf file has
See page 1 or page ??
That is, the "\at{page}[regularref]" doesn't work. (But the workaround
reference does work.)
If the figure's location key is changed from "none" to "nonumber" or
just deleted, then the regularref page reference works.
It also works with MkII (with or without "none"), so I am guessing that
it is a bug in MkIV.
-Sanjoy
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