On 14 Apr 2013, at 07:05, Hans Hagen <pragma@wxs.nl> wrote:

> 
> On 4/13/2013 12:33 PM, Robert Blackstone wrote:
>> Dear all,
>> A few days ago (10 April 2013, Vol.106, Issue 25) I posted a question
>> about giving related but not necessarily adjacent floats the same
>> number, as for example Fig. 2a and Fig. 2b.
>> In the meantime I found a, not very elegant, solution that only partly
>> satisfies me.
> 
> I cooked up something experimental ... after several variants i ended up 
> with a solution that is only available in the keyword variant:
> 
> \useMPlibrary[dum]
> 
> \starttext
> 
> First line.
> 
> \startplacefigure[location=here,reference=first,title=first]
>     \externalfigure[dummy][height=2cm]
> \stopplacefigure
> 
> Second line.
> 
> \startplacefigure[location=here,reference=second,title=second,group=alpha,groupsuffix=.a]
>     \externalfigure[dummy][height=2cm]
> \stopplacefigure
> 
> Third line.
> 
> \startplacefigure[location=here,reference=third,title=third]
>     \externalfigure[dummy][height=2cm]
> \stopplacefigure
> 
> Fourth line.
> 
> \startplacefigure[location=here,reference=fourth,title=fourth,group=alpha,groupsuffix=.b]
>     \externalfigure[dummy][height=2cm]
> \stopplacefigure
> 
> Fifth line.
> 
> \startplacefigure[location=here,reference=fifth,title=fifth,group=alpha,groupsuffix=.c]
>     \externalfigure[dummy][height=2cm]
> \stopplacefigure
> 
> Last line: \in[first] / \in[second] / \in[third] / \in[fourth] / \in[fifth].
> 
> \page
> 
> \placelist[figure]
> 
> \stoptext
> 
> (beware: it's groupsuffix, and not suffix as that will add another one 
> not tracked in the lists)
> 
> Hans

Thank you very much, Hans. This is really perfect for my purpose.

Best regards,

Robert