Where to find the code for the BibTeX integration?

Where to find the code for the BibTeX integration?

[Jannis Pohlmann]

Hi all,

I would like to extend \setuppublicationlist by adding another numbering
alternative: numbering=key. The only files I could find in the ConTeXt
tree that contain something related to the numbering of BibTeX
publication lists were bibl-{tra,bib}.{mkii,mkiv}. 

Since I'm using MKIV I tried to change those files but for that to work
I had to use 

  \usemodule[bibl-bib] or \usemodule[bibl-tra]

instead of 

  \usemodule[bib] 

the latter of which doesn't seem to be necessary with MKIV anyway. I did
some searching in the LuaTeX code as well as in the ConTeXt tree but I
couldn't find the right place to extend the behavior of
\setuppublicationlist with the standard bib feature of MKIV.

So I'm wondering: where is all this implemented? How would I go about
adding numbering=key? 

Any hints and suggestions are welcome!

Cheers,
Jannis
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