Hi Severin,

Maybe this is what you want:
%%%%% begin
%% defining \proclaim which is built in Plain-teX
%% but has disappeared from ConTeXt
\defineenumeration[proclaim]
	[text=,
	style=slanted,
	title=yes,
	titleleft=,
	titleright=,
	location=serried,
	width=fit,
	right={.~}]
\setupnumber[proclaim][way=bysection,numbersection=yes]
%% end definition \proclaim

%% defining \remark 
\defineenumeration[remark]
	[text=,
	style=rm,
	title=yes,
	titleleft=,
	titleright=,
	location=serried,
	width=fit,
	right={.~}]
\setupnumber[remark][number=proclaim]
%% end definition \remark

\starttext
\input knuth.tex

\startproclaim[lem:Yoneda]{Yanada Theorem}
This is a theorem in set category theory.
\stopproclaim

\startremark{Remark}
The above theorem and this remark are numbered sequentially.
\stopremark

\section{A new section}

\input knuth.tex

\startproclaim[lem:Yoneda2]{Yanada Theorem}
As said above, this is a theorem in set category theory.
\stopproclaim

\startremark{Remark}
The above theorem and this remark are numbered sequentially.
\stopremark

\stoptext
%%%%% end

Best regards: OK

On 3 mars 2011, at 09:05, S Barmeier wrote:

> Currently I am using something like
> 
> \defineenumeration[lemma]
>   [location=serried,
>    headstyle=bold,
>    text=Lemma,
>    width=broad,
>    style=italic]
> 
> to define theorems, lemmas, etc.
> 
> Sometimes a theorem or lemma will have its own name (e.g. Yoneda Lemma),
> and I find it slightly cumbersome to write something like
> 
> 3.1 Theorem (Yoneda Lemma)
> 3.1 Lemma (Yoneda)
> 3.1 Lemma (Yoneda Lemma)
> 
> and was really hoping that
> 
> \startlemma[text={Yoneda Lemma}]
> 
> would give me the desired
> 
> 3.1 Yoneda Lemma
> 
> but it doesn't. I would like to keep the whole setup the same and only
> change the text for this instance. Is there any way to implement this
> except for defining a whole new enumeration for one
> theorem/lemma/proposition by
> 
> \startenumeration[text={Yoneda Lemma},location= ... ]
> 
> Thank you.
> Severin
> 
> 
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