Many thanks, Wolfgang, for your quick and complete solution to my riddle.
As Hans has commented, it is really brilliant.
I must confess that I do not understand yet the substance of it, i.e. the
definition itself of *Fleuron*, but I will keep studying it and will end
for getting it, I hope.
For the moment I have analyzed and elaborated a bit on your example, first
and mostly by commenting it, but also by slightly modifying it so that it
shows more clearly the characteristics of your solution. I attach it here
just in case it could be as helpful for someone else as it has been for me.
Many thanks again and good luck!
Francisco
% Fleuron.tex
% Example script of the creation and use of a documental ornament
% We first define the documental ornament
% under the traditional name of *Fleuron*
% in the way brilliantly formulated by Herr Schuster
\def\Fleuron
{\par
\leaders\vbox to \lineheight{I am the \em Fleuron\em}\vfil}
% and create a page 10 lines high for testing its behaviour
\setuplayout[lines=10]
% We put *Context* to work
\starttext
% Method 1 (really?)
% Typesetting the ornament as the first element of the page
% results disappointing: it just does not show up
\Fleuron
% but other texts that follow it get their normal treatment;
% for instance, this sentence
I am not really the start:\par
\ \ \ the \em Fleuron\em\ went before me\par
% or this automatically generated text
\dorecurse{4}{Line \recurselevel\par}
% Even the *Fleuron* is treated the same,
% if it is the last element of this page
\Fleuron
% so we create a new page and repeat the same
% instructions
\page
I am not really the start:\par
\ \ \ the \em Fleuron\em\ went before me\par
\dorecurse{4}{Line \recurselevel\par}
\Fleuron
I am after the \em Fleuron\em\
% surprisingly, although there is room available,
% the ornament disappears
% if there is more text coming after it
% so we go to another page, the third one,
% for our last and definitive test
\page
% This time the space of the page is full
\dorecurse{10}{Line \recurselevel\par}
% when the turn of the *Fleuron* arrives
\Fleuron
% The result is that not only the *Fleuron* does not show up
% in this page, which was to be expected because it is full,
% but even the implied next page, the fourth,
% does not get generated by *Context*. PERFECT!
\stoptext
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