The verbatim commands have a range key which let you select parts of the 
code,
you can use line numbers to include a small block (e.g. range={3,10} or 
range {3,+7})
or you put labels in your code.

\startbuffer
% cmd:one:begin
\define\FirstCommand
   {\dosingleempty\doFirstCommand}

\def\doFirstCommand[#1]%
   {This is the definition for the first command}
% cmd:one:end

% cmd:two:begin
\define\SecondCommand
   {\dosingleempty\doSecondCommand}

\def\doSecondCommand[#1]%
   {This is the definition for the second command}
% cmd:two:end
\stopbuffer

\starttext
\typebuffer[range={cmd:two:begin,cmd:two:end}]
\stoptext

Wolfgang
> N. Raghavendra <mailto:nyraghu27132@gmail.com>
> 21. April 2018 um 16:00
> I am writing some notes using ConTeXt, which involves displaying parts
> of some program source files. At present, I am manually cutting and
> pasting the parts into the ConTeXt file. Is it possible to make ConTeXt
> do that for me? I am thinking of including each part of the Coq sources
> between tags like this:
>
> ------------------------------------------------------------
> $ cat src-file
> <tag-1>
> part_to_be_included_1
> </tag-2>
>
> <tag-2>
> part_to_be_included_2
> </tag-2>
> ------------------------------------------------------------
>
> I would like to say something like
>
> \IncludePart{src-file}{tag-1}
>
> in my ConTeXt file to get
>
> part_to_be_included_1
>
> at that place in the PDF output after I run `context'. I would
> appreciate any advice on how to go about this.
>
> Thanks,
> Raghu.
>
> --
> N. Raghavendra <raghu@hri.res.in>, http://www.retrotexts.net/
> Harish-Chandra Research Institute, http://www.hri.res.in/
> ___________________________________________________________________________________
> 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://context.aanhet.net
> archive : https://bitbucket.org/phg/context-mirror/commits/
> wiki : http://contextgarden.net
> ___________________________________________________________________________________