Dear Hans,

thanks for your answer.
i found a workaround by using only the key for the crossref and adding the 
"img::" in the macro. 

below is the working example (just for the record)

regards michael


-------

\startbuffer[duane]

    @image {tug2014,
        title       = "TUG 2014",
        url         = "http://tug.org/tug2014/";,
        url_image   = "http://tug.org/art/tug2014-color.jpg";,
        url_thumb   = "http://tug.org/tug2014/t2014-thumb.jpg";,
        description = "Official drawing of the TUG 2014 conference",
        author      = "Duane Bibby",
        year        = 2014,
    }

\stopbuffer

\definebtxdataset
 [duane]

\usebtxdataset
 [duane]
 [duane.buffer]

\usebtxdefinitions      
 [duane]

\definebtxrendering
    [duane]
    [dataset=duane,
     method=local, 
    ]

\setupbtxlist
    [duane]
    [number=no]

\startsetups btx:duane:cite:image
   {\externalfigure[\btxfield{url_image}][width=10cm]}
\stopsetups

 \def\bild[#1]#2%
    {\placefigure[here][#1]{#2}{\cite[image][duane::#1]}}%

\def\bildref[#1]%
        {\in{\bf Fig.}[#1]}

\startsetups btx:duane:list:image
  \btxfield{title} 
\stopsetups

\starttext

   %\enabletrackers
   % [publications.setups]
   
   \bild[tug2014]\par
   
   \input tufte
         
   \bildref[tug2014]

   \page

   \placebtxrendering[duane]

\stoptext






On 10.10.2015, at 11:35, Hans Hagen <pra...@wxs.nl>
 wrote:

> On 10/10/2015 10:26 AM, Eidenbenz  Michael wrote:
>> Hello,
>> 
>> I have double colons (::) in my reference points.
>> (It's actually the same string I also use to refer to my publication 
>> database)
>> But they wont show up as you can see in the example below.
>> 
>> Is there any way to fix this?
>> 
>> Thanks for your help and best regards
> 
> :: and ::: have special meaning (:; for another document and ::: for 
> components and such)
> 
>> Michael
>> 
>> -----
>> 
>> \starttext
>> 
>> \placefigure[here][img:cow]{This is a cow}{\externalfigure[cow.jpg]}\par
>> \placefigure[here][img::mill]{This is a mill}{\externalfigure[mill.png]}\par
>> 
>> The picture in \in{Figure}[img:cow] is a cow\par
>> The picture in \in{Figure}[img::mill] is a mill (cross reference is not 
>> working)\par
>> 
>> \stoptext
>> 
>> -----
>> ___________________________________________________________________________________
>> If your question is of interest to others as well, please add an entry to 
>> the Wiki!
>> 
>> maillist : ntg-context@ntg.nl / 
>> http://www.ntg.nl/mailman/listinfo/ntg-context
>> webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
>> archive  : http://foundry.supelec.fr/projects/contextrev/
>> wiki     : http://contextgarden.net
>> ___________________________________________________________________________________
>> 
> 
> 
> -- 
> 
> -----------------------------------------------------------------
>                                          Hans Hagen | PRAGMA ADE
>              Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>    tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
>                                             | www.pragma-pod.nl
> -----------------------------------------------------------------
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the 
> Wiki!
> 
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
> archive  : http://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________

___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the 
Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
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