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I have read the questions: biblatex: multiple bibliographies categorised by different .bib files and sorting multiple bibliographies in biblatex, but although I profoundly respect all the work that has been done (notably by @PLK) to solve these questions, the provided solutions do no yet fully comply with my wishes.

I dream of a solution in biblatex/biber in which each .bib file would be treated independently (which would offer the maximum flexibility, in my opinion). The syntax should rely on a single command, say \printbib, which would produce a single bibliography. Combining several bibliographies could be possible, using simple commands of the form

\printbib[Parameters1]{BibFile1.bib} 
...
\printbib[Parameters2]{BibFile2.bib} 
...
\printbib[Parameters2]{BibFile3.bib}

These commands should not rely on keywords (I would like to be totally free about the contents of my .bib files). I understand that the syntax of biblatex using

\addbibresource{BibFile.bib}

in the preamble is really different, but is there any hope to realize my dreams?

P.S. By the way, this would also give a convenient way to reuse the .bib files produced by bibunits.

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    This isn't the place for feature requests, but I can't say I agree with your idea of what the default behaviour should be. More to the point, however, you can already use Biber to add keywords dynamically on a per .bib file basis (see command \perdatasource). Thus, you can give all entries of each file a unique keyword via \DeclareSourcemap and achieve your goal while nonetheless being 'totally free about the contents of [your] .bib files'. – jon Jul 18 '15 at 21:08
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    Also: in order to facilitate answers, please provide a MWE example which includes at least two .bib files: no one wants to create everything anew just to answer someone else's question. – jon Jul 18 '15 at 21:11
  • As jon said, you can automatically and dynamically add a keyword using Biber. See Biblatex equivalent to labeled multibib with working hyperref and another example of \predatasource BibLaTeX - The localization without a language key. – moewe Jul 19 '15 at 6:15
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    Note that the approaches above doe the same as PLK did in biblatex: multiple bibliographies categorised by different .bib files but with the source-mapping from within the document, not via an extra file. – moewe Jul 19 '15 at 7:21
  • Would you be able to articulate your issue with a solution that uses in-document sourcemapping with \perdatasource to automatically add keywords to your different bib files so they can later be filtered (so you will not have to modify the keywords in the .bib file)? Or is that approach fine? This approach might not exactly be realisable as the one-line command you dream of, but in its effect it should be right up your street (from what I gather so far - if, however, you have further wishes than just producing split bibliographies, a more detailed question would help us understand those). – moewe Jul 20 '15 at 7:32
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The simplest solution uses refsection (cf. p.78, biblatex manual).

Ex:

\begin{refsection}[bibfile1.bib]
\nocite{*}  
\begin{refcontext}[... options ...]
\printbibliography 
\end{refcontext}
\end{refsection}

where ... options ... is your particular options for this particular bib file.

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