[NTG-context] No small caps?

[Giuseppe Bilotta]

I have Palatino as main font set up with

\usetypescript[adobekb][8r]
\loadmapfile[context-base]
\usetypescript[palatino][8r]
\setupbodyfont[palatino,rm,12pt]
\switchtobodyfont[12pt]

Plus I have

\setupcapitals[sc=yes]
\definestartstop[abstract]
[before={\sc Abstract.\hskip1em}]


But

\starttext
\startabstract
In this article we will analyze a few techniques that can be
used to approximate, by means of Bézier cubics, envelopes of
circles centered on Bézier cubics. Such an approximation is
useful, if not necessary, in several applications in many
branches of computer graphics, ranging from CAD to outline
font conversions.
\stopabstract
\stoptext

does not give me Abstract in small caps.

-- 
Giuseppe "Oblomov" Bilotta