On Mon, 12 Dec 2011, Otared Kavian wrote:

> Hi Wolfgang,
>
> Thank you for your attention: in fact you pointed out how to solve the problem…
> Beginning with what you wrote, after a few trials and errors I ended up with the following which gives what I meant:
> %%% begin reverse-enumeration.tex
> \definenumber[ReverseNumberOrder][numberorder=reverse]
>
> \defineenumeration[Lecture]
> 	[location=hanging,
> 	text={Lecture n° {\convertednumber[ReverseNumberOrder]}.},
> 	between=,
> 	before={\incrementnumber[ReverseNumberOrder]},
> 	number=no,
> 	after={\hrule\blank}]

Untested, but

\defineenumeration[Lecture][number=ReverseNumberOrder]

should also work.

Aditya