Krdytkyu

Doing as it has been suggested on this site, and also having looked in the manual for biblatex.pdf, I cannot figure out the difference between DeclareDatamodeFields and DeclareDatamodeEntryfields. I only get the address field as the result (Paris in this case). pdflatex, biber.

MWE

documentclass{article}

usepackage[datamodel=manuscript,bibstyle=verbose,citestyle=verbose]{biblatex}

begin{filecontents}{manuscript.dbx}

DeclareDatamodelEntrytypes{manuscript}

DeclareDatamodelFields[type=field, datatype=literal]{datation,title,library}

DeclareDatamodelEntryfields[manuscript]{

title,

library,

datation}

end{filecontents}

begin{filecontents}{maniscript.bib}

@manuscript{P1470,

    library={BNF},

    address={Paris},

    datation={textsc{viii}textsuperscript{e} s.}

end{filecontents}



bibliography{manuscript.bib}

begin{document}

nocite{*}



printbibliography

end{document}

You are actually pretty close. If you look at moewe's canonical answer on the topic you can get a better grasp on the possibilities and requirements of creating a new entrytype.

Still, to get your new fields typeset in the bibliography, you are critically missing a driver for you manuscript entrytype. I'm not sure the format you are looking for, but this serves as an example:

DeclareBibliographyDriver{manuscript}{%

  usebibmacro{begentry}%

  printfield{library}%

  setunit{addcommaspace}%

  printlist{location}%

  newunitnewblock

  printfield{title}%

  setunit{addcommaspace}%

  printfield{datation}%

  usebibmacro{finentry}%

}

I've also removed title and library from your .dbx file, as they are already defined by default. You should still add them to your DeclareDatamodelEntryfields[manuscript]{... as you do. Also, note that setting both citestyle and bibstyle to verbose is equivalent to the more direct style=verbose.

In full:

documentclass{article}



usepackage[datamodel=manuscript,style=verbose]{biblatex}



usepackage{filecontents}



begin{filecontents}{manuscript.dbx}

  DeclareDatamodelEntrytypes{manuscript}

  DeclareDatamodelFields[type=field, datatype=literal]{datation}

  DeclareDatamodelEntryfields[manuscript]{

    title,

    library,

    location,

    datation}

end{filecontents}



begin{filecontents}{manuscript.bib}

@manuscript{P1470,

  library = {BNF},

  title = {A title},

  location = {Paris},

  datation = {textsc{viii}textsuperscript{e} s.},

}

end{filecontents}



DeclareBibliographyDriver{manuscript}{%

  usebibmacro{begentry}%

  printfield{library}%

  setunit{addcommaspace}%

  printlist{location}%

  newunitnewblock

  printfield{title}%

  setunit{addcommaspace}%

  printfield{datation}%

  usebibmacro{finentry}%

}



DeclareFieldFormat[manuscript]{title}{mkbibquote{#1isdot}}



addbibresource{manuscript.bib}



begin{document}

nocite{*}

printbibliography

end{document}

You can, and should, examine closer moewe's linked answer, particularly the formatting directives. Also, you can redefine your bibdriver to the order of fields and punctuation of your liking.