Pourquoi ne pas créer de nouveaux mots clés?
\documentclass{article}
\usepackage{biblatex}
\usepackage{filecontents}
\begin{filecontents*}{\jobname.bib}
@book{knuth,
author = {Knuth, Donald E.},
title = {The {\TeX} book},
date = 1984,
maintitle = {Computers \& Typesetting},
volume = {A},
publisher = {Addison-Wesley},
location = {Reading, Mass.},
langid = {english},
langidopts = {variant=american},
sortyear = {1984-1},
sorttitle = {Computers & Typesetting A},
indexsorttitle= {The TeXbook},
indextitle = {\protect\TeX book, The},
shorttitle = {\TeX book},
bibliography = {bib yes}
}
@article{einstein,
author = {Einstein, A.},
title = {Die Grundlage der allgemeinen Relativitätstheorie},
journal = {Annalen der Physik},
volume = {354},
number = {7},
doi = {10.1002/andp.19163540702},
pages = {769--822},
year = {1916},
index= {idx yes}
}
\end{filecontents*}
\addbibresource{\jobname.bib}
\DeclareSourcemap{
%
% declaring new field
\maps[datatype=bibtex,overwrite=true]{
\map{
\step[fieldsource=index, final=true]
\step[fieldset=usera, origfieldval, final=true]
}
\map{
\step[fieldsource=bibliography, final=true]
\step[fieldset=userb, origfieldval, final=true]
}
}
}
\renewbibmacro*{finentry}{
\printfield{usera}
\printfield{userb}
\finentry
}
\begin{document}
\nocite{*}
\printbibliography
\end{document}
