Btukfyl

Trying to loop over child entries within a modified set driver in biblatex I get a behaviour of entrydata* I do not understand.

When calling

  renewcommand{do}[1]{%

    message{^^Jxset Warning: inside loop for ##1^^J}%

    entrydata*{##1}{message{^^Jxset Warning: entrydata check loop run for entrykey=thefield{entrykey} with savedentrykey=thefield{savedentrykey}^^J}}}%

  edefxset@tempa{thefield{entryset}}expandafterdocsvlistexpandafter{xset@tempa}%

within the driver I get

xset Warning: inside loop for A:V1

xset Warning: entrydata check loop run for entrykey=A:V1 with savedentrykey=

xset Warning: inside loop for A:V2

xset Warning: entrydata check loop run for entrykey=A:V2 with savedentrykey=

where savedentrykey should - as far as I understand it - be A and not empty.

Even

  entryset{message{^^Jxset Warning: entryset pre code executed^^Jentrykey=thefield{entrykey} savedentrykey=thefield{savedentrykey}}}

           {message{^^Jxset Warning: entryset post code executed^^Jentrykey=thefield{entrykey} savedentrykey=thefield{savedentrykey}}}%

does not work (which probably should???)...

Any idea what I am missing?

MWE:

documentclass{article}

usepackage[ansinew]{inputenc}

usepackage[ngerman]{babel}

usepackage[babel,german=quotes]{csquotes}

usepackage[doi=false,defernumbers=true,backend=biber,subentry,sorting=nyt,sortsets=true,style=numeric-comp]{biblatex}

usepackage{xpatch}



newlinechar=`^^J



makeatletter

begin{filecontents}{jobname.bib}

@Set{A,

  entryset    = {A:V1,A:V2,A:V3},

}

@Book{A:V1,

  author      = {Rene Goscinny and Albert Uderzo},  title       = {Asterix der Gallier},

  maintitle   = {Asterix und Obelix},               sorttitle   = {Asterix und Obelix 01},

  year        = {1959},                             isbn        = {1234567890123},

  publisher   = {Dargaud},                          location    = {Paris},

  volume      = {1},

}

@Book{A:V2,

  author      = {Rene Goscinny and Albert Uderzo},  title       = {Asterix und Kleopatra},

  maintitle   = {Asterix und Obelix},               sorttitle   = {Asterix und Obelix 02},

  year        = {1968},                             isbn        = {2345678901234},

  publisher   = {Dargaud},                          location    = {Paris},

  volume      = {2},

}

@Book{A:V3,

  author      = {Rene Goscinny and Albert Uderzo},  title       = {Asterix als Gladiator},

  maintitle   = {Asterix und Obelix},               sorttitle   = {Asterix und Obelix 03},

  year        = {1969},                             isbn        = {3456789012345},

  publisher   = {Dargaud},                          location    = {Paris},

  volume      = {3},

}

end{filecontents}



DeclareBibliographyDriver{set}{%

  message{^^Jxset Warning: entering set driver^^Jentrykey=thefield{entrykey} savedentrykey=thefield{savedentrykey}^^J}%

  renewcommand{do}[1]{%

    message{^^Jxset Warning: inside loop for ##1^^J}%

    entrydata*{##1}{message{^^Jxset Warning: entrydata check loop run for entrykey=thefield{entrykey} with savedentrykey=thefield{savedentrykey}^^J}}}%

  edefxset@tempa{thefield{entryset}}expandafterdocsvlistexpandafter{xset@tempa}%

  entryset{message{^^Jxset Warning: entryset pre code executed^^Jentrykey=thefield{entrykey} savedentrykey=thefield{savedentrykey}}}

           {message{^^Jxset Warning: entryset post code executed^^Jentrykey=thefield{entrykey} savedentrykey=thefield{savedentrykey}}}%

  newunitnewblock

  usebibmacro{setpageref}%

  finentry}

makeatother



addbibresource{jobname.bib}



begin{document}

nocite{*}

printbibliography

end{document}

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