that is a a completion of my question Datamodel in biblatex, hashname and biber, but I opened a new question because the problem is more problematic.

If any roots want to merge, no problem.

I want to declare new entrytype and new field. I have two solutions: - use \DeclareSourceMap to map entry field (in bib) to another output field (for use with \printfield{} - use new datamap model, to allow to have new fields in my output file.

For some reasons, I prefered to use the second way. So I read biblatex handbook.

I made a manuscripts.dbx file, with this content


If I read correctly the handbook, it's enough to allow to have datation field in my .bbl file.

My .bib file has this content

    Datation={\textsc{viii}\textsuperscript{e} s.}

And my main file has this content


When I run xelatex -> no problem

When I run biber -> the bbl output file is empty.

If I comment \DeclareDatamodelEntryfields{datation} -> the bbl output file is not empty, but the field datation is not added to the bbl output file.

If I comment Datation={\textsc{viii}\textsuperscript{e} s.} -> -> the bbl output file is not empty, but the field datation is not added to the bbl output file.

I am on Os X, with Biber 1.8

I I run with latemk, latexmk said "Command for 'biber example' gave return code 6400"

  • same problem with .cfg file (indeed, the .bcf file is the same).
    – Maïeul
    Nov 25, 2013 at 19:17
  • I have mode \DeclareDatamodelFields[type=field,datatype=literal]. It's working. I was persuaded to have done that. It seems I have forgotten. Thanks for your help
    – Maïeul
    Nov 25, 2013 at 19:19
  • The handbook did'nt say it was mandatory...
    – Maïeul
    Nov 25, 2013 at 19:21
  • We can remove the comments
    – Guido
    Nov 25, 2013 at 19:28
  • I will fix this in the manual and re-upload 2.8a.
    – PLK
    Nov 25, 2013 at 20:37

1 Answer 1


When you define a new field with \DeclareDatamodelField you have to specify the type and the datatype. In your case you need.


The biblatex manual does not specify whether such options are required.

  • yes, thank. I was persuaded to try it. Indeed not.
    – Maïeul
    Nov 25, 2013 at 19:24

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