%D \module
%D   [       file=publ-ini,
%D        version=2013.05.12,
%D          title=\CONTEXT\ Publication Support,
%D       subtitle=Initialization,
%D         author=Hans Hagen,
%D           date=\currentdate,
%D      copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.

% TODO: s! vs v! for default and neutral key/values
% todo: too many refs in list

% TODO A.-B. Foo (dash as connector, see JMH)

% todo: no need for all these %'s

% todo: tagging
% todo: we cannot use 'default' as this wipes metadata names (maybe no longer do that)
% todo: \v!cite => \s!cite
% todo: interface with (ml)bibtex (export -> call -> import)
% todo: check if 'all' etc are ok ... either use list or use other criterium
% todo: \the\everysetupbtxciteplacement probably too often

% \definecolor[btx:field]   [darkred]
% \definecolor[btx:crossref][darkblue]
% \definecolor[btx:key]     [darkgreen]
% \definecolor[btx:todo]    [darkyellow]

%D We operate on several axis:
%D
%D \startitemize[packed]
%D \startitem we can have several databases (or combinations) \stopitem
%D \startitem we can add entries to them if needed (coded in tex) \stopitem
%D \startitem we can have several lists each using one of the databases \stopitem
%D \startitem we can render each list or citation independently \stopitem
%D \stopitemize
%D
%D We assume that the rendering of a list entry is consistent in a document,
%D although one can redefine properties if needed. Adding more granularity would
%D complicate the user interface beyond comprehension.

\writestatus{loading}{ConTeXt Publication Support / Initialization}

\registerctxluafile{publ-dat}{1.001}
\registerctxluafile{publ-ini}{1.001}
\registerctxluafile{publ-sor}{1.001}
\registerctxluafile{publ-aut}{1.001}
\registerctxluafile{publ-usr}{1.001}
\registerctxluafile{publ-oth}{1.001} % this could become an option
\registerctxluafile{publ-fnd}{1.001} % new method (for the moment only local)
\registerctxluafile{publ-jrn}{1.001}
\registerctxluafile{publ-reg}{1.001}

\unprotect

\startcontextdefinitioncode

\def\s!btx          {btx}

\def\v!btxcite      {btxcite}
\def\v!btxlist      {btxlist}
\def\v!btxrendering {btxrendering}

\def\s!btxset       {btxset}
\def\s!btxref       {btxref}
\def\s!btxint       {btxint}
\def\s!btxbck       {btxbck}
\def\s!btxltx       {btxltx}
\def\s!btxrtx       {btxrtx}
\def\s!btxatx       {btxatx}
\def\s!btxbtx       {btxbtx}
\def\s!btxspc       {btxspc}
\def\s!btxlst       {btxlst}
\def\s!btxcom       {btxcom}

\definelabelclass[btxlabel][2]

\clf_definelabels{btxlabel}{btx}\s!false\relax

% It is not that trivial to come up with a proper organization of setup
% and control commands for publications. This is because we have complex
% inline as well as extensive list rendering. The rules are partially
% driven by somewhat archaic bibtex specifications and evolving journal
% (or field) specific demands. The logic in the standards is often so
% complex that it looks like manual rendering is assumed. But, we want to
% automate the process as much as possible.
%
% Another complication is that in manuals we want to demonstrate different
% properties of the implementation and therefore we need a way to handle
% independent standards, databases, etc. This has resulted in the following
% organization:
%
% - general setup (rather minimal)
% - list setup (rendering)
% - cite setup
% - dataset setup
%
% The rendering is mostly driven by setups. In there we can call for fields
% in the database but also for virtual fields or combinations.

% The main rendering style (standard driven).

%D We assume that a specification is global or used grouped. It doesn't make much sense
%D to split between cite and list here as it only complicates matters (timing) and is
%D not clear either.

\let\currentbtxspecification\empty

\unexpanded\def\startbtxrenderingdefinitions[#1]%
  {\unprotect
   \pushmacro\currentbtxspecification
   \edef\currentbtxspecification{#1}}

\unexpanded\def\stopbtxrenderingdefinitions
  {\popmacro\currentbtxspecification
   \protect}

\unexpanded\def\loadbtxdefinitionfile [#1]{\clf_btxloaddefinitionfile {#1}}
\unexpanded\def\loadbtxreplacementfile[#1]{\clf_btxloadreplacementfile{#1}}

\unexpanded\def\publ_specification_push#1%
  {\pushmacro\currentbtxspecification
   \pushmacro\currentbtxspecificationfallback
   \edef\currentbtxspecification{#1}%
   \edef\currentbtxspecificationfallback{\namedbtxparameter\currentbtxspecification\c!default}%
   \ifx\currentbtxspecificationfallback\currentbtxspecification
     \let\currentbtxspecificationfallback\empty
   \fi
   \clf_btxsetspecification{\currentbtxspecification}}

\unexpanded\def\publ_specification_pop
  {\popmacro\currentbtxspecificationfallback
   \popmacro\currentbtxspecification
   \clf_btxsetspecification{\currentbtxspecification}}

\unexpanded\def\publ_specification_set#1% beware: is global
  {\edef\currentbtxspecification{#1}%
   \edef\currentbtxspecificationfallback{\namedbtxparameter\currentbtxspecification\c!default}%
   \ifx\currentbtxspecificationfallback\currentbtxspecification
     \let\currentbtxspecificationfallback\empty
   \fi
  % has to be done explicitly: \loadbtxdefinitionfile[\currentbtxspecification]%
   \ifx\currentbtxspecification\empty
     % we set default at the end
   \else
     \clf_btxsetspecification{\currentbtxspecification}%
   \fi}% todo: ,true == also load

\installcorenamespace {btx}

\installswitchcommandhandler \??btx {btx} \??btx

% because we have lots of setups we provide a checker for sloppy users

\unexpanded\def\btx_check_chain#1#2#3%
  {\doifelsesomething{#3}
     {\writestatus{btx #1}{defining\space"#2"\space as\space descendant\space of\space"#3"}% we're in definition regime (no space)
      \definebtx[#2][#3]}
     {\writestatus{btx #1}{defining\space"#2"}%
      \definebtx[#2]}}

% \unexpanded\def\btxcheckdefine#1#2{\doifelsecommandhandler\??btx{#1}\donothing{\btx_check_chain{define}{#1}{#2}}}
% \unexpanded\def\btxchecksetup #1#2{\doifelsecommandhandler\??btx{#1}\donothing{\btx_check_chain {setup}{#1}{#2}}}

\unexpanded\def\btxcheckdefine#1{\doifelsecommandhandler\??btx{#1}\gobbleoneargument{\btx_check_chain{define}{#1}}} % {#2}
\unexpanded\def\btxchecksetup #1{\doifelsecommandhandler\??btx{#1}\gobbleoneargument{\btx_check_chain {setup}{#1}}} % {#2}

% for the moment experimental:

\unexpanded\def\btxenableautodefine
  {\prependtoks
     \clf_checkinterfacechain{\currentbtx}{btxcheckdefine}%
   \to \everydefinebtx
   \prependtoks
     \ifnum\btxsetupmode=\doingrootsetupnamed
       \clf_checkinterfacechain{\currentbtx}{btxchecksetup}%
     \fi
   \to \everysetupbtx
   \let\btxenableautodefine\relax}

\appendtoks
    \ifnum\btxsetupmode=\doingrootsetuproot
        \publ_specification_set{\btxparameter\c!specification}%
    \else\ifnum\btxsetupmode=\doingrootsetupnamed
        \doifelsecommandhandler\??btx\currentbtx
          {\publ_specification_set{\btxparameter\c!specification}}%
          {}% maybe a warning
    \fi\fi
\to \everysetupbtx

\appendtoks
    \ifnum\btxsetupmode=\doingrootsetuproot
        \edef\currentbtxdataset{\clf_btxsetdataset{\btxparameter\c!dataset}{\currentbtxdataset}}%
    \fi
\to \everysetupbtx

\appendtoks
    \publ_specification_set{\btxparameter\c!specification}%
\to \everyjob

\unexpanded\def\startusingbtxspecification[#1]%
  {\publ_specification_push{#1}}

\let\stopusingbtxspecification\publ_specification_pop

% \setupbtxlist[alternative=paragraph,width=auto,distance=\emwidth]
% \setupbtxlist[alternative=paragraph,width=auto,distance=\emwidth,margin=2em] % useless
% \setupbtxlist[alternative=paragraph,width=fit,distance=\emwidth]
% \setupbtxlist[alternative=paragraph,width=fit,distance=\emwidth,margin=2em]

% here starts the bib stuff

\installcorenamespace {btxdataset}
\installcorenamespace {btxrendering}
\installcorenamespace {btxregister}
\installcorenamespace {btxcommand}
\installcorenamespace {btxrenderingdefinition}

\installcommandhandler \??btxdataset   {btxdataset}   \??btxdataset
\installcommandhandler \??btxregister  {btxregister}  \??btxregister
\installcommandhandler \??btxrendering {btxrendering} \??btxrendering

\let\currentbtxcitealternative\empty

\let\currentbtxspecificationfallback\empty

\unexpanded\def\setbtxparameterset#1#2%
  {\edef\currentbtx
     {\ifcsname\??btx\currentbtxspecification:#1:#2:\s!parent\endcsname
        \currentbtxspecification:%
      \else\ifx\currentbtxspecificationfallback\empty
      \else\ifcsname\??btx\currentbtxspecificationfallback:#1:#2:\s!parent\endcsname
        \currentbtxspecificationfallback:%
      \fi\fi\fi#1:#2}}

\unexpanded\def\setbtxparametersetroot#1%
  {\edef\currentbtx
     {\ifcsname\??btx\currentbtxspecification:#1:\s!parent\endcsname
        \currentbtxspecification:#1%
      \else\ifx\currentbtxspecificationfallback\empty
      \else\ifcsname\??btx\currentbtxspecificationfallback:#1:\s!parent\endcsname
        \currentbtxspecificationfallback:#1%
      \fi\fi\fi}}

\unexpanded\def\setbtxrendering
  {\edef\currentbtxrendering
     {\ifcsname\??btx\currentbtxspecification:\s!parent\endcsname
        \currentbtxspecification
      \else\ifx\currentbtxspecificationfallback\empty
      \else\ifcsname\??btx\currentbtxspecificationfallback:\s!parent\endcsname
        \currentbtxspecificationfallback
      \fi\fi\fi}}

\unexpanded\def\setbtxlist % maybe simplify this one, always list=rendering?
  {\edef\currentbtxlist
     {\ifcsname\??btx\currentbtxrendering:\s!parent\endcsname
        \currentbtxrendering
      \else\ifcsname\??btx\currentbtxspecification:\s!parent\endcsname
        \currentbtxspecification
      \else\ifx\currentbtxspecificationfallback\empty
      \else\ifcsname\??btx\currentbtxspecificationfallback:\s!parent\endcsname
        \currentbtxspecificationfallback
      \fi\fi\fi\fi}%
   \edef\currentlist{\s!btx:\currentbtxlist}}

\unexpanded\def\usebtxdataset
  {\begingroup
   \dotripleempty\publ_use_dataset}

\def\publ_use_dataset[#1][#2][#3]%
  {\getdummyparameters[\c!specification=\currentbtxspecification,#3]%
   \ifsecondargument
     \clf_btxusedataset
        specification {\dummyparameter\c!specification}%
        dataset       {#1}%
        filename      {#2}%
     \relax
   \else\iffirstargument
     \clf_btxusedataset
        specification {\dummyparameter\c!specification}%
        dataset       {\v!default}%
        filename      {#1}%
     \relax
   \fi\fi
   \endgroup}

\definebtxdataset
  [\v!default]
% [\c!language=] % nothing set so use current

% \usebtxdataset
%   [default]
%   [mybibs.bib]

\let\startpublication\relax
\let\stoppublication \relax

\unexpanded\def\startpublication
  {\dodoubleempty\publ_set_publication}

\def\publ_set_publication[#1][#2]%
  {\begingroup
   \catcode\commentasciicode\othercatcode
   \ifsecondargument
     \expandafter\publ_set_publication_indeed
   \else\iffirstargument
     \doubleexpandafter\publ_set_publication_checked
   \else
     \doubleexpandafter\publ_set_publication_default
   \fi\fi{#1}{#2}}

\def\publ_set_publication_default#1#2%
  {\publ_set_publication_indeed\v!default{#1}}

\def\publ_set_publication_checked#1#2%
  {\doifelseassignment{#1}
     {\publ_set_publication_indeed\v!default{#1}}
     {\publ_set_publication_indeed{#1}{}}}

\def\publ_set_publication_indeed#1#2#3\stoppublication
  {\clf_btxaddentry{#1}{#2}{\detokenize{#3}}%
   \endgroup
   \ignorespaces}

% commands

\unexpanded\def\btxcommand#1%
  {\ifcsname\??btxcommand#1\endcsname
     \expandafter\publ_command_yes
   \else
     \expandafter\publ_command_nop
   \fi{#1}}

\let\btxcmd\btxcommand

\def\publ_command_yes#1%
  {\csname\??btxcommand#1\endcsname}

\def\publ_command_nop#1%
  {\ifcsname#1\endcsname
     \showmessage\m!publications{10}{#1,#1}%
     \global\expandafter\let\csname\??btxcommand#1\expandafter\endcsname\csname#1\endcsname
   \else\ifcsname\utfupper{#1}\endcsname
     \showmessage\m!publications{10}{#1}{\utfupper{#1}}%
     \global\expandafter\let\csname\??btxcommand#1\expandafter\endcsname\csname\utfupper{#1}\endcsname
   \else
     \showmessage\m!publications{11}{#1}%
     \setugvalue{\??btxcommand#1}{\underbar{\tttf#1}}%
   \fi\fi
   \publ_command_yes{#1}}

\unexpanded\def\definebtxcommand#1% {body} #1..#n{body}
  {\setuvalue{\??btxcommand\csstring#1}}%

% tracing

\installtextracker
  {publications.crosslinks}
  {\let\btx_trace_list_cross\strc_references_tracer}
  {\let\btx_trace_list_cross\gobbletwoarguments}

\let\btx_trace_list_cross\gobbletwoarguments

% access

\let\currentbtxtag    \empty
\let\currentbtxdataset\v!default

\unexpanded\def\setbtxentry[#1]% or maybe btxsetentry
  {\edef\currentbtxtag{\clf_btxsetentry{\currentbtxdataset}{#1}}}

% \let\btxsetdataset\setbtxdataset
% \let\btxsetentry  \setbtxentry

% todo: no need for the currents as we can keep them at the lua end so we will have
%
% \btxfield         : current
% \btxspecificfield : dataset,tag,key

\def\btxfield      #1{\clf_btxfield      {\currentbtxdataset}{\currentbtxtag}{#1}}
\def\btxdetail     #1{\clf_btxdetail     {\currentbtxdataset}{\currentbtxtag}{#1}}
\def\btxflush      #1{\clf_btxflush      {\currentbtxdataset}{\currentbtxtag}{#1}}
\def\btxdirect     #1{\clf_btxdirect     {\currentbtxdataset}{\currentbtxtag}{#1}}
\def\btxfieldname  #1{\clf_btxfieldname  {\currentbtxdataset}{\currentbtxtag}{#1}}
\def\btxfieldtype  #1{\clf_btxfieldtype  {\currentbtxdataset}{\currentbtxtag}{#1}}
\def\btxfoundname  #1{\clf_btxfoundname  {\currentbtxdataset}{\currentbtxtag}{#1}}
\def\btxfoundtype  #1{\clf_btxfoundtype  {\currentbtxdataset}{\currentbtxtag}{#1}}
\def\btxauthorfield#1{\clf_btxauthorfield              \currentbtxauthorindex{#1}}
\def\btxdoifelse   #1{\clf_btxdoifelse   {\currentbtxdataset}{\currentbtxtag}{#1}}
\def\btxdoif       #1{\clf_btxdoif       {\currentbtxdataset}{\currentbtxtag}{#1}}
\def\btxdoifnot    #1{\clf_btxdoifnot    {\currentbtxdataset}{\currentbtxtag}{#1}}

\let\btxsetup\fastsetup

%D How complex will we go? Can we assume that e.g. an apa style will not be mixed
%D with another one? I think this assumption is okay. For manuals we might want to
%D mix but we can work around it.

%D Rendering.

\unexpanded\def\btxspace                 {\removeunwantedspaces\space}
\unexpanded\def\btxnobreakspace          {\removeunwantedspaces\nobreakspace} % these two are
\unexpanded\def\btxnbsp                  {\removeunwantedspaces\nbsp}         % the same anyway
\unexpanded\def\btxperiod                {\removeunwantedspaces.\space}
\unexpanded\def\btxcomma                 {\removeunwantedspaces,\space}
\unexpanded\def\btxcommabreak            {\removeunwantedspaces,\hskip\zeropoint plus .5\emwidth\relax}
\unexpanded\def\btxcolon                 {\removeunwantedspaces:\space}
\unexpanded\def\btxsemicolon             {\removeunwantedspaces;\space}
\unexpanded\def\btxlparent               {\removeunwantedspaces\space(} % obsolete
\unexpanded\def\btxrparent               {\removeunwantedspaces)\space} % obsolete
\unexpanded\def\btxleftparenthesis       {\removeunwantedspaces\space(}
\unexpanded\def\btxrightparenthesis      {\removeunwantedspaces)\space}
\unexpanded\def\btxrightparenthesisperiod{\removeunwantedspaces).\space}
\unexpanded\def\btxrightparenthesiscomma {\removeunwantedspaces),\space}
\unexpanded\def\btxleftbracket           {\removeunwantedspaces\space[}
\unexpanded\def\btxrightbracket          {\removeunwantedspaces]\space}
\unexpanded\def\btxrightbracketperiod    {\removeunwantedspaces].\space}
\unexpanded\def\btxrightbracketcomma     {\removeunwantedspaces],\space}

%D Variables:

\let\currentbtxbacklink     \empty    \unexpanded\def\btxsetbacklink     {\def\currentbtxbacklink}
\let\currentbtxbacktrace    \empty    \unexpanded\def\btxsetbacktrace    {\def\currentbtxbacktrace}
\let\currentbtxcategory     \empty    \unexpanded\def\btxsetcategory     {\def\currentbtxcategory}
\let\currentbtxcombis       \empty    \unexpanded\def\btxsetcombis       {\def\currentbtxcombis}
\let\currentbtxdataset      \empty    \unexpanded\def\btxsetdataset      {\def\currentbtxdataset}
\let\currentbtxfirst        \empty    \unexpanded\def\btxsetfirst        {\def\currentbtxfirst}
\let\currentbtxsecond       \empty    \unexpanded\def\btxsetsecond       {\def\currentbtxsecond}
%let\currentbtxthird        \empty    \unexpanded\def\btxsetthird        {\def\currentbtxthird}
\let\currentbtxsuffix       \empty    \unexpanded\def\btxsetsuffix       {\def\currentbtxsuffix}
\let\currentbtxinternal     \empty    \unexpanded\def\btxsetinternal     {\def\currentbtxinternal}
\let\currentbtxlefttext     \empty    \unexpanded\def\btxsetlefttext     {\def\currentbtxlefttext}
\let\currentbtxrighttext    \empty    \unexpanded\def\btxsetrighttext    {\def\currentbtxrighttext}
\let\currentbtxbefore       \empty    \unexpanded\def\btxsetbefore       {\def\currentbtxbefore}
\let\currentbtxafter        \empty    \unexpanded\def\btxsetafter        {\def\currentbtxafter}
\let\currentbtxlanguage     \empty    \unexpanded\def\btxsetlanguage     {\def\currentbtxlanguage}
\let\currentbtxtag          \empty    \unexpanded\def\btxsettag          {\def\currentbtxtag}
\let\currentbtxnumber       \empty    \unexpanded\def\btxsetnumber       {\def\currentbtxnumber}
\let\currentbtxauthorvariant\v!normal \unexpanded\def\btxsetauthorvariant{\def\currentbtxauthorvariant}

\let\currentbtxfirstnames   \empty    \unexpanded\def\btxsetfirstnames{\let\currentbtxfirstnames\currentbtxfirstnames_indeed}
\let\currentbtxinitials     \empty    \unexpanded\def\btxsetinitials  {\let\currentbtxinitials  \currentbtxinitials_indeed  }
\let\currentbtxjuniors      \empty    \unexpanded\def\btxsetjuniors   {\let\currentbtxjuniors   \currentbtxjuniors_indeed   }
\let\currentbtxsurnames     \empty    \unexpanded\def\btxsetsurnames  {\let\currentbtxsurnames  \currentbtxsurnames_indeed  }
\let\currentbtxvons         \empty    \unexpanded\def\btxsetvons      {\let\currentbtxvons      \currentbtxvons_indeed      }

\newconstant\currentbtxoverflow       \unexpanded\def\btxsetoverflow   #1{\currentbtxoverflow   #1\relax}
\newconstant\currentbtxconcat         \unexpanded\def\btxsetconcat     #1{\currentbtxconcat     #1\relax}
\newconstant\currentbtxcount          \unexpanded\def\btxsetcount      #1{\currentbtxcount      #1\relax}
\newconstant\currentbtxauthorindex    %unexpanded\def\btxsetauthorindex#1{\currentbtxauthorindex#1\relax} % passed directly
\newconstant\currentbtxauthorcount    %unexpanded\def\btxsetauthorcount#1{\currentbtxauthorcount#1\relax} % passed directly
\newconstant\currentbtxauthorstate    \unexpanded\def\btxsetauthorstate#1{\currentbtxauthorstate#1\relax}

\unexpanded\def\currentbtxfirstnames_indeed{\clf_btxcurrentfirstnames\numexpr\currentbtxauthorindex\relax}
\unexpanded\def\currentbtxinitials_indeed  {\clf_btxcurrentinitials  \numexpr\currentbtxauthorindex\relax}
\unexpanded\def\currentbtxjuniors_indeed   {\clf_btxcurrentjuniors   \numexpr\currentbtxauthorindex\relax}
\unexpanded\def\currentbtxsurnames_indeed  {\clf_btxcurrentsurnames  \numexpr\currentbtxauthorindex\relax}
\unexpanded\def\currentbtxvons_indeed      {\clf_btxcurrentvons      \numexpr\currentbtxauthorindex\relax}

\let\currentbtxfirstpage    \empty \unexpanded\def\btxsetfirstpage    #1{\def\currentbtxfirstpage{\btx_page_number{#1}}}
\let\currentbtxlastpage     \empty \unexpanded\def\btxsetlastpage     #1{\def\currentbtxlastpage {\btx_page_number{#1}}}
\let\currentbtxfirstinternal\empty \unexpanded\def\btxsetfirstinternal  {\def\currentbtxfirstinternal}
\let\currentbtxlastinternal \empty \unexpanded\def\btxsetlastinternal   {\def\currentbtxlastinternal}

\def\currentbtxauthorvariant{normal}

\unexpanded\def\btx_reset_list % not needed as we're grouped
  {\let\currentbtxcombis   \empty
   \let\currentbtxcategory \empty
   \let\currentbtxinternal \empty
   \let\currentbtxlefttext \empty
   \let\currentbtxrighttext\empty
   \let\currentbtxbefore   \empty
   \let\currentbtxafter    \empty
   \let\currentbtxbacklink \empty
   \let\currentbtxbacktrace\empty
   \let\currentbtxlanguage \empty
   \let\currentbtxsuffix   \empty
  %\let\currentbtxdataset  \empty % will always be set
  %\let\currentbtxtag      \empty % will always be set
   \let\currentbtxnumber   \empty}

\unexpanded\def\btx_reset_cite % check for less .. not all resets needed when we're grouped (only subcites)
  {\let        \currentbtxfirst      \empty
   \let        \currentbtxsecond     \empty
   \let        \currentbtxsuffix     \empty
   \let        \currentbtxinternal   \empty
   \let        \currentbtxlefttext   \empty
   \let        \currentbtxrighttext  \empty
   \let        \currentbtxbefore     \empty
   \let        \currentbtxafter      \empty
   \let        \currentbtxbacklink   \empty
   \let        \currentbtxbacktrace  \empty % not used here
   \let        \currentbtxlanguage   \empty
  %\let        \currentbtxdataset    \empty % will always be set, beware of local reset ~
  %\let        \currentbtxtag        \empty % will always be set, beware of local reset ~
   \let        \currentbtxnumber     \empty
   \setconstant\currentbtxoverflow   \zerocount
   \setconstant\currentbtxconcat     \zerocount
   \setconstant\currentbtxcount      \zerocount}

\unexpanded\def\btx_reset_page % probably not needed
  {\let        \currentbtxfirstpage    \empty
   \let        \currentbtxlastpage     \empty
   \let        \currentbtxfirstinternal\empty
   \let        \currentbtxlastinternal \empty
   \setconstant\currentbtxoverflow     \zerocount
   \setconstant\currentbtxconcat       \zerocount
   \setconstant\currentbtxcount        \zerocount}

\unexpanded\def\btx_reset_numbering  % probably not needed
  {\let        \currentbtxfirst \empty
   \let        \currentbtxsecond\empty
   \let        \currentbtxsuffix\empty
   \setconstant\currentbtxconcat\zerocount}

%D Pages:

\unexpanded\def\btx_page_number#1%
  {\def\currentlistindex{#1}%
   \structurelistpagenumber}

%D Language:

\def\mainbtxlanguage{\currentmainlanguage}

\unexpanded\def\btx_check_language
  {\let\mainbtxlanguage\currentlanguage
   \ifx\currentbtxlanguage\empty
     \let\currentbtxlanguage\currentlanguage
   \else
     \btx_check_language_indeed
   \fi}

\unexpanded\def\btx_check_language_indeed
  {\edef\currentbtxlanguage{\reallanguagetag\currentbtxlanguage}%
   \ifx\currentbtxlanguage\empty
     \let\currentbtxlanguage\currentlanguage
   \else\ifx\currentbtxlanguage\currentlanguage\else
     \setcurrentlanguage\currentmainlanguage\currentbtxlanguage
   \fi\fi}

%D Tracing

\newconditional\c_btx_trace % not used yet

\installtextracker
  {btxrendering}
  {\settrue \c_btx_trace}
  {\setfalse\c_btx_trace}

%D Rendering lists and citations.

\unexpanded\def\btxtodo#1%
  {[#1]}

%D Lists:

\newdimen\d_publ_number_width

\ifdefined\btxblock       \else \newcount\btxblock       \fi \btxblock\plusone
\ifdefined\btxcitecounter \else \newcount\btxcitecounter \fi % maybe pass this to lua

\newtoks \everysetupbtxlistplacement % name will change
\newtoks \everysetupbtxciteplacement % name will change

\definelist % only used for selecting
  [\s!btx]

\setuplist
  [\s!btx]
  [\c!prefixstopper=:,
   \c!state=\v!start,
   \c!alternative=a,
  %\c!alternative=\v!paragraph,
  %\c!width=\v!auto,
  %\c!distance=\emwidth,
   \c!before=\blank,
   \c!after=\blank]

\unexpanded\def\setupbtxlist
  {\dodoubleempty\publ_setup_list}

\unexpanded\def\publ_setup_list[#1][#2]%
  {\ifsecondargument
     \setuplist[\s!btx:#1][#2]%
   \else\iffirstargument
     \setuplist[\s!btx][#1]%
   \fi\fi}

\appendtoks
    \ifx\currentbtxrenderingparent\empty
        \definelist
          [\s!btx:\currentbtxrendering]%
          [\s!btx]%
    \else\ifx\currentbtxrenderingparent\s!btx
        \definelist
          [\s!btx:\currentbtxrendering]%
          [\s!btx]%
    \else
        \definelist
          [\s!btx:\currentbtxrendering]%
          [\s!btx:\currentbtxrenderingparent]%
    \fi\fi
\to \everydefinebtxrendering

\newconditional\c_btx_list_texts

\appendtoks
    \doifelse{\btxrenderingparameter\c!textstate}\v!start
      \settrue\setfalse\c_btx_list_texts
\to \everysetupbtxlistplacement

\newconditional\c_btx_list_pages

\appendtoks
    \doifelse{\btxrenderingparameter\c!pagestate}\v!start
      \settrue\setfalse\c_btx_list_pages
\to \everysetupbtxlistplacement

\unexpanded\def\btx_entry_inject_pages % for the moment only normal
  {\dontleavehmode
   \begingroup
   \setbtxlist % probably already set
   \btx_reset_page
   \setbtxparameterset\s!list\s!page
   \btxparameter\c!command
     {\usebtxstyleandcolor\c!style\c!color
      \btxparameter\c!left
      \clf_btxflushpages{\currentbtxdataset}{\currentbtxtag}%
      \btxparameter\c!right}%
   \endgroup}

\unexpanded\def\btxpagesetup#1% there will b eno left|right|command|style at this inner level
  {\begingroup
   \publ_fast_setup\plusfive\s!list\s!page
   \endgroup
   \btx_reset_page} % probably not needed

\unexpanded\def\btxnumberingsetup#1%
  {\begingroup
   \setbtxparameterset{\c!list:\s!numbering}\currentbtxnumbering % brrrr   \setbtxlist
   \btxparameter\c!left
 % \btxparameter\c!command{\publ_fast_setup\plusthree{\s!list:\s!numbering}{#1}}%
   \publ_fast_setup\plusthree{\s!list:\s!numbering}{#1}%
   \btxparameter\c!right
   \endgroup
   \btx_reset_numbering} % probably not needed

% end of page stuff

\unexpanded\def\btx_entry_inject
  {\begingroup
   \redoconvertfont % see (**) in strc-lst, this will become an configuration option
   \edef\currentbtxcategory{\btxfield{category}}%
   \ignorespaces
   \ifconditional\c_btx_list_texts
     \currentbtxbefore
   \fi
   \begingroup
   \usebtxstyleandcolor\c!style\c!color
   \ignorespaces
   \publ_fast_setup\plusfour\s!list\currentbtxcategory
   \removeunwantedspaces
   \endgroup
   \ifx\currentbtxcombis\empty \else
     \btxrenderingparameter\c!separator
     % maybe move this loop to lua
     \begingroup
       \processcommacommand[\currentbtxcombis]\btx_entry_inject_combi
     \endgroup
   \fi
   \ifconditional\c_btx_list_pages
     \btx_entry_inject_pages
   \fi
   \ifconditional\c_btx_list_texts
     \currentbtxafter
   \fi
   \endgroup}

\unexpanded\def\btxshowentryinline
  {\dodoubleempty\btx_entry_show_inline}

\unexpanded\def\btx_entry_show_inline[#1][#2]%
  {\ifsecondargument
     \ctxcommand{showbtxentry("#1","#2")}
   \else\iffirstargument
     \ctxcommand{showbtxentry("\currentbtxdataset","#1")}
   \else
     \ctxcommand{showbtxentry("\currentbtxdataset","\currentbtxtag")}
   \fi\fi}

\unexpanded\def\btxstartcombientry
  {\begingroup}

\unexpanded\def\btxstopcombientry
  {\endgroup}

\unexpanded\def\btxhandlecombientry
  {\btx_reference_indeed}

\def\btx_entry_inject_combi#1%
  {\begingroup
   \def\currentbtxtag{#1}%
   \ignorespaces
   \publ_fast_setup\plusfour\s!list\currentbtxcategory
   \removeunwantedspaces
   \endgroup}

% uses reference when set

% \def\btx_entry_inject_combi#1%
%   {\begingroup
%    \def\currentbtxtag{#1}%
%    \ignorespaces
%    \btxdoifelsecombiinlist\currentbtxdataset\currentbtxtag
%      {\clf_btxflushlistcombi{\currentbtxdataset}{\currentbtxtag}}
%      {\publ_fast_setup\plusfour\s!list\currentbtxcategory}%
%    \removeunwantedspaces
%    \endgroup}

\unexpanded\def\completebtxrendering{\dodoubleempty\publ_place_list_complete}
\unexpanded\def\placebtxrendering   {\dodoubleempty\publ_place_list_standard}

\let\completelistofpublications\completebtxrendering
\let\placelistofpublications   \placebtxrendering

\newtoks\everybtxlistrendering

\appendtoks
    \setbtxlist
    %
    \edef\currentbtxcriterium{\btxrenderingparameter\c!criterium}% \v!cite will become \s!cite
    \ifx\currentbtxcriterium\empty
        \let\currentbtxcriterium\v!previous
    \else\ifx\currentbtxcriterium\v!cite
        \let\currentbtxcriterium\v!here
    \fi\fi
    %
    \iflocation
        \letinteractionparameter\c!style\empty
    \fi
\to \everybtxlistrendering

\def\nofbtxlistentries  {0}
\def\currentbtxlistentry{0}
\def\currentbtxlistindex{0} % only for internal use (points back to big list)

\newconditional\c_publ_prefixed

\unexpanded\def\btxsetnoflistentries  #1{\edef\nofbtxlistentries  {#1}}
\unexpanded\def\btxsetcurrentlistentry#1{\edef\currentbtxlistentry{#1}}
\unexpanded\def\btxsetcurrentlistindex#1{\edef\currentbtxlistindex{#1}}

\unexpanded\def\btxdoifelsesameaspreviouschecked#1#2% #1 == always | doublesided
  {\clf_btxdoifelsesameasprevious
     {\currentbtxdataset}%
     \currentbtxlistentry%
     {#2}%
     \c_btx_list_reference
     {#1}}

\unexpanded\def\btxdoifelsesameasprevious
  {\btxdoifelsesameaspreviouschecked\v!doublesided}

\unexpanded\def\btxdoifelsecombiinlist#1#2%
  {\clf_btxdoifelsecombiinlist{#1}{#2}}

\let\btxdoifsameaspreviouscheckedelse\btxdoifelsesameaspreviouschecked
\let\btxdoifsameaspreviouselse       \btxdoifelsesameasprevious
\let\btxdoifcombiinlistelse          \btxdoifelsecombiinlist

\def\publ_place_list_indeed#1[#2][#3]%
  {\begingroup
   \ifsecondargument
     % [rendering] [settings]
     \edef\currentbtxrendering{#2}%
     \setupcurrentbtxrendering[#3]%
     \edef\p_specification{\btxrenderingparameter\c!specification}%
     \ifx\p_specification\empty\else
       \let\currentbtxspecification\p_specification
     \fi
   \else\iffirstargument
     \doifelseassignment{#2}
       {% [settings]
        \let\currentbtxrendering\currentbtxspecification
        \setupcurrentbtxrendering[#2]%
        \edef\p_specification{\btxrenderingparameter\c!specification}%
        \ifx\p_specification\empty\else
           \let\currentbtxspecification\p_specification
           \let\currentbtxrendering\currentbtxspecification % tricky
        \fi}
       {\edef\currentbtxrendering{#2}%
        \edef\p_specification{\btxrenderingparameter\c!specification}%
        \ifx\p_specification\empty\else
          \let\currentbtxspecification\p_specification
        \fi}%
   \else
     \let\currentbtxrendering\currentbtxspecification
   \fi\fi
   \setbtxparameterset\currentbtxspecification\s!list
   \the\everybtxlistrendering
   \ifconditional#1\relax
     \edef\currentbtxrenderingtitle{\btxrenderingparameter\c!title}%
     \ifx\currentbtxrenderingtitle\empty
       \normalexpanded{\startnamedsection[\v!chapter][\c!reference=\currentbtxrendering,\c!title={\headtext{\currentbtxrendering}}]}%
     \else
       \normalexpanded{\startnamedsection[\v!chapter][\c!reference=\currentbtxrendering,\c!title={\currentbtxrenderingtitle}]}%
     \fi
   \fi
   \ifx\currentbtxrendering\empty
     \setbtxrendering % hm
   \fi
   \btxrenderingparameter\c!before
   \edef\currentbtxdataset{\btxrenderingparameter\c!dataset}%
   \uselanguageparameter\btxdatasetparameter % new
   \setbtxlist
   \the\everystructurelist
   \the\everysetupbtxlistplacement
   \forgetall
   % why not pass this with collect .. todo
   % here we just collect items
   \clf_btxcollectlistentries
       names     {\s!btx}%
       criterium {\currentbtxcriterium}%
       reference {\btxrenderingparameter\c!reference}%
       method    {\btxrenderingparameter\c!method}%
       dataset   {\currentbtxdataset}%
       keyword   {\btxrenderingparameter\c!keyword}%
       sorttype  {\btxrenderingparameter\c!sorttype}%
       repeated  {\btxrenderingparameter\c!repeat}%
       ignored   {\btxrenderingparameter\c!ignore}%
       group     {\btxrenderingparameter\c!group}%
   \relax
   \ifnum\nofbtxlistentries>\zerocount
     \startpacked[\v!blank]%
     % sorting and so
     \clf_btxpreparelistentries{\currentbtxdataset}% could be put in collect
     % next we analyze the width
     \ifx\currentbtxnumbering\empty \else
       \edef\p_width{\listparameter\c!width}%
       \ifx\p_width\v!auto
         \setbox\scratchbox\vbox \bgroup
           \settrialtypesetting
           \clf_btxfetchlistentries{\currentbtxdataset}%
         \egroup
         \d_publ_number_width\wd\scratchbox
         \letlistparameter\c!width\d_publ_number_width
       \fi
     \fi
     \doifelse{\listparameter\c!prefix}\v!yes\settrue\setfalse\c_publ_prefixed
     % this actually typesets them, we loop here as otherwise the whole
     % bunch gets flushed at once
     \dorecurse\nofbtxlistentries
        {\let\currentbtxlistentry\recurselevel
         \clf_btxflushlistentry{\currentbtxdataset}\currentbtxlistentry\relax}%
     \stoppacked
   \fi
   \btxrenderingparameter\c!after
   \global\advance\btxblock\plusone
   \ifconditional#1\relax
     \stopnamedsection
   \fi
   \endgroup}

\def\publ_place_list_complete{\publ_place_list_indeed\conditionaltrue}
\def\publ_place_list_standard{\publ_place_list_indeed\conditionalfalse}

\def\currentbtxblock{\number\btxblock}

% called at the lua end, for determining the width

\unexpanded\def\btxchecklistentry
  {\begingroup
   % todo, switch to font
   \hbox{\btx_reference_checked}%
   \par
   \endgroup}

% called at the lua end, the real rendering

% we could have a yes and no where o nils the btx_reference_indeed ... saves a check there

\installstructurelistprocessor{\s!btx}
  {\let\currentlistentrynumber    \btx_reference_indeed
   \let\currentlistentrytitle     \btx_entry_indeed
   \let\currentlistentrypagenumber\btx_page_indeed
   \strc_lists_apply_renderingsetup}

\def\btx_entry_indeed
  {\btx_list_reference_inject
   \btx_entry_inject}

\def\btx_page_indeed
  {}

\unexpanded\def\btxhandlelistentry
  {\strc_lists_entry_process}

\unexpanded\def\btxstartlistentry % maybe pass i
  {\begingroup
   \global\advance\c_btx_list_reference\plusone}

\unexpanded\def\btxstoplistentry
  {\iftrialtypesetting
     \global\advance\c_btx_list_reference\minusone
   \fi
   \endgroup}

\newtoks\everybtxlistentry

\unexpanded\def\btxlistsetup#1% used for the reference in the list
  {\the\everybtxlistentry
   \everybtxlistentry\emptytoks % so only once per entry to be sure
   \publ_fast_setup\plusfour\s!list{#1}}

\appendtoks
    \btx_check_language
\to \everybtxlistentry

\unexpanded\def\btx_reference_indeed
  {\begingroup
   % redundantm will go away:
   \setbtxparameterset{\c!list:\s!numbering}\currentbtxnumbering
   %
   \ifx\currentbtxnumbering\empty
     % nothing
   \else\ifx\currentbtxnumbering\v!no
     % nothing
   \else
     \usebtxstyleandcolor\c!style\c!color % new, needed?
     \ifconditional\c_publ_prefixed\btxlistprefixednumber\fi
     \clf_btxlistvariant % some can go
       {\currentbtxdataset}%
       {\currentbtxblock}%
       {\currentbtxtag}%
       {\currentbtxnumbering}%
       {\currentbtxnumber}%
     \relax
   \fi\fi
   \endgroup}

\unexpanded\def\btxlistprefixednumber % hack but alan needs it
  {\clf_listprefixednumber
     {\currentlist}%
     \currentbtxlistindex
     {%
        prefix        {\listparameter\c!prefix}%
        separatorset  {\listparameter\c!prefixseparatorset}%
        conversionset {\listparameter\c!prefixconversionset}%
        starter       {\listparameter\c!prefixstarter}%
        stopper       {\listparameter\c!prefixstopper}%
        set           {\listparameter\c!prefixset}%
        segments      {\listparameter\c!prefixsegments}%
        connector     {\listparameter\c!prefixconnector}%
     }%
   \relax}

\unexpanded\def\btx_reference_checked
  {\dontleavehmode\hbox\bgroup
     \btx_reference_indeed
   \egroup}

\newcount\c_btx_list_reference

\unexpanded\def\btx_list_reference_inject
  {\dontleavehmode\begingroup % no box
     \iftrialtypesetting\else
       \btx_list_reference_inject_now
     \fi
   % \btx_reference_indeed % else double entry in list
   \endgroup}

\def\btx_list_reference_inject_now
  {\btx_trace_list_cross\empty\currentbtxbacktrace
   \strc_references_direct_full_user
      {\ifx\currentbtxdataset\v!default\else\s!btxset=\currentbtxdataset,\fi%
       \s!btxref=\currentbtxtag,%
       \s!btxspc=\currentbtxspecification,%
       \s!btxlst=\number\c_btx_list_reference,% check if needed
      %\ifx\currentbtxcombis\empty\else\s!btxcom={\currentbtxcombis},\fi%
       \ifx\currentbtxbefore\empty\else\s!btxbtx={\currentbtxbefore},\fi%
       \ifx\currentbtxafter \empty\else\s!btxatx={\currentbtxafter },\fi%
       \ifx\currentbtxbacklink\currentbtxbacktrace\s!btxint=\currentbtxbacklink\else\s!btxbck=\currentbtxbacktrace\fi}%
      {\s!btx::\v!list::\number\c_btx_list_reference}%
      {\currentbtxnumber}}

\newconditional\c_btx_cite_reference_injected

\unexpanded\def\btx_cite_reference_inject
  {\ifconditional\c_btx_cite_reference_injected
   \else
     \dontleavehmode
     \iftrialtypesetting \else
       \ifx\currentbtxbacklink\empty
         % can be made empty when combining author / year
       \else
         \btx_cite_reference_inject_indeed
         \settrue\c_btx_cite_reference_injected
       \fi
     \fi
  \fi}

\newtoks\t_btx_reference_inject

\def\btx_cite_reference_inject_indeed
  {\btx_trace_list_cross\currentbtxbacklink\empty
   \the\t_btx_reference_inject
   \strc_lists_inject_direct % todo: make like \btx_list_reference_inject_now with { }
      [\s!btx]%
      [\c!type=\s!btx]% \c!location=\v!none
      [\ifx\currentbtxdataset\v!default\else\s!btxset=\currentbtxdataset,\fi%
       \s!btxref=\currentbtxtag,%
      %\ifx\currentbtxcombis\empty\else\s!btxcom={\currentbtxcombis},\fi%
       \ifx\currentbtxbefore\empty\else\s!btxbtx={\currentbtxbefore},\fi%
       \ifx\currentbtxafter \empty\else\s!btxatx={\currentbtxafter },\fi%
       \s!btxint=\number\currentbtxbacklink
       \ifx\currentbtxciteuservariables\empty\else,\currentbtxciteuservariables\fi]}

\def\currentbtxuservariable #1{\clf_btxuservariable        {\currentbtxdataset}{#1}}
\def\btxdoifelseuservariable#1{\clf_btxdoifelseuservariable{\currentbtxdataset}{#1}}

\let\btxdoifuservariableelse\btxdoifelseuservariable

\let\btxcitereference\btx_cite_reference_inject

\let\currentbtxnumbering\empty

\appendtoks
    \edef\currentbtxnumbering{\btxrenderingparameter\c!numbering}%
    \ifx\currentbtxnumbering\v!yes
        \def\currentbtxnumbering{num}% convenient alias
        \letbtxrenderingparameter\c!numbering\currentbtxnumbering
        \letlistparameter\c!headnumber\v!always
    \else\ifx\currentbtxnumbering\v!no
        \letlistparameter\c!headnumber\v!no
        \let\currentbtxnumbering\empty
      % \letlistparameter\c!textcommand\outdented % needed? we can use titlealign
        \letlistparameter\c!symbol     \v!none
        \letlistparameter\c!aligntitle \v!yes
        \letlistparameter\c!numbercommand\firstofoneargument % for the moment, no doubling needed
    \else
        \letlistparameter\c!headnumber\v!always
    \fi\fi
    \let\currentlistmethod\s!btx
\to \everysetupbtxlistplacement

\unexpanded\def\btxremapauthor
  {\dodoubleargument\btx_remap_author}

\def\btx_remap_author[#1][#2]%
  {\clf_btxremapauthor{#1}{#2}}

\unexpanded\def\btxflushauthor
  {\doifelsenextoptionalcs\btx_flush_author_yes\btx_flush_author_nop}

\unexpanded\def\btxflushsuffix
  {\ifx\currentbtxsuffix\empty
     % nothing
   \else
     \characters{\currentbtxsuffix}% todo : rendering specific converter
   \fi}

\def\btx_flush_author_yes[#1]{\btx_flush_author{#1}}
\def\btx_flush_author_nop    {\btx_flush_author{\btxparameter\c!authorconversion}}

\unexpanded\def\btx_flush_author#1#2%
  {\begingroup
   \edef\currentbtxfield{#2}%
   \setbtxparameterset\s!list\currentbtxfield
% \let\currentbtxlistvariant\currentbtxfield
   \clf_btxauthor
        {\currentbtxdataset}%
        {\currentbtxtag}%
        {\currentbtxfield}%
        {%
            combiner    {#1}%
            kind        {list}%
            etallimit   {\btxparameter\c!etallimit}%
            etaldisplay {\btxparameter\c!etaldisplay}%
            etaloption  {\btxparameter\c!etaloption}%
            symbol      {\btxparameter{\c!stopper:initials}}%
            connector   {\btxparameter{\c!connector:initials}}%
        }%
   \relax
   \endgroup}

% yes or no: maybe just \flushauthor{...}{...}

\unexpanded\def\btxflushauthorname         {\btx_flush_author{name}}          % #1
\unexpanded\def\btxflushauthornormal       {\btx_flush_author{normal}}        % #1
\unexpanded\def\btxflushauthornormalshort  {\btx_flush_author{normalshort}}   % #1
\unexpanded\def\btxflushauthorinverted     {\btx_flush_author{inverted}}      % #1
\unexpanded\def\btxflushauthorinvertedshort{\btx_flush_author{invertedshort}} % #1

\unexpanded\def\currentbtxciteauthor % always author
  {\begingroup
   %\setbtxparameterset\s!cite\s!author
   % the alternatives inherit from cite:author
   % and APA distinguishes authoryears from authoryear ("and" vs. "&")
   \setbtxparameterset\s!cite\currentbtxcitealternative
   \clf_btxauthor
        {\currentbtxdataset}%
        {\currentbtxtag}%
        {\s!author}%
        {%
            combiner    {\btxparameter\c!authorconversion}%
            kind        {cite}%
            etallimit   {\btxparameter\c!etallimit}%
            etaldisplay {\btxparameter\c!etaldisplay}%
            etaloption  {\btxparameter\c!etaloption}%
            symbol      {\btxparameter{\c!stopper:initials}}%
        }%
   \relax
   \endgroup}

\unexpanded\def\btxstartauthor#1#2#3% a state > 0 signals that some authors can clash
  {\begingroup
   \currentbtxauthorindex#1\relax
   \currentbtxauthorcount#2\relax
   \currentbtxauthorstate#3\relax}

\unexpanded\def\btxstopauthor
  {\endgroup}

\unexpanded\def\btxciteauthorsetup#1{\fastsetup{\s!btx:\s!cite:\s!author:#1}}
\unexpanded\def\btxlistauthorsetup#1{\fastsetup{\s!btx:\s!list:\s!author:#1}}

% \btxflushauthor{author}
% \btxflushauthor{editor}
%
% \btxflushauthor[name]{author}
% \btxflushauthor[normal]{author}
% \btxflushauthor[normalshort]{author}
% \btxflushauthor[inverted]{author}
% \btxflushauthor[invertedshort]{author}

% \btxflushauthor{author}
% \btxflushauthor{editor}
%
% \btxflushauthor[name]{author}
% \btxflushauthor[normal]{author}
% \btxflushauthor[normalshort]{author}
% \btxflushauthor[inverted]{author}
% \btxflushauthor[invertedshort]{author}

% Interaction

\newconditional\btxinteractive
\newconditional\btx_interactive

% of maybe modes?

\appendtoks
    \iflocation
        \edef\p_interaction{\btxparameter\c!interaction}%
        \ifx\p_interaction\v!stop
            \setfalse\btxinteractive
        \else
            \settrue\btxinteractive
            \ifx\p_interaction\v!all
                \settrue\btx_interactive
            \else
                \setfalse\btx_interactive
            \fi
        \fi
    \else
        \setfalse\btxinteractive
        \setfalse\btx_interactive
    \fi
\to \everysetupbtxlistplacement

\appendtoks
    \iflocation
        \edef\p_interaction{\btxparameter\c!interaction}%
        \ifx\p_interaction\v!stop
            \setfalse\btxinteractive
        \else
            \settrue\btxinteractive
        \fi
    \else
        \setfalse\btxinteractive
    \fi
\to \everysetupbtxciteplacement

%D When a publication is cited, we need to signal that somehow. This is done with the
%D following (not user) command. We could tag without injecting a node but this way
%D we also store the location, which makes it possible to ask local lists.

%D \macros{cite,nocite,citation,nocitation,usecitation}
%D
%D The inline \type {\cite} command creates a (often) short reference to a publication
%D and for historic reasons uses a strict test for brackets. This means, at least
%D in the default case that spaces are ignored in the argument scanner. The \type
%D {\citation} commands is more liberal but also gobbles following spaces. Both
%D commands insert a reference as well as a visual clue.
%D
%D The \type {no} commands all do the same (they are synonyms): they make sure that
%D a reference is injected but show nothing. However, they do create a node so best
%D attach them to some text in order to avoid spacing interferences. A slightly
%D less efficient alternative is \type {\cite[none][tag]}.

% [tags]
% [settings|variant][tags]
% [base::tags]
% [settings|variant][base::tags]

% these need to be sort of protected:

% methods:
%
% hidden : mark for list, don't show in text
% list   : mark for list, show in text only when in list
% text   : not to list, show in text
% always : mark for list, show in text

\let\p_publ_cite_before   \empty
\let\p_publ_cite_after    \empty
\let\p_publ_cite_lefttext \empty
\let\p_publ_cite_righttext\empty

\let\currentbtxciteuservariables\empty

\unexpanded\def\btxhybridcite % so one can alias the old
  {\dontleavehmode
   \begingroup
   \strictdoifelsenextoptional\publ_cite_tags_options\publ_cite_tags_indeed}

\unexpanded\def\publ_cite_tags_options[#1]%
  {\strictdoifelsenextoptional{\publ_cite_tags_options_indeed{#1}}{\publ_cite_tags_indeed{#1}}}

\unexpanded\def\publ_cite_tags_indeed#1%
  {\letinteractionparameter\c!style\empty
   \setbtxparametersetroot\s!cite % we need to get the default
   \edef\currentbtxcitealternative{\btxparameter\c!alternative}%
   \setbtxparameterset\s!cite\currentbtxcitealternative
   \edef\currentbtxcitetag{#1}%
   \the\everysetupbtxciteplacement
   \publ_cite_variant
   \endgroup}

\unexpanded\def\publ_cite_tags_options_indeed#1%
  {\doifelseassignment{#1}\publ_cite_tags_settings_indeed\publ_cite_tags_variants_indeed{#1}}

\def\publ_cite_tags_settings_indeed#1[#2]%
  {\letinteractionparameter\c!style\empty
  %\letinteractionparameter\c!color\empty
   \letdummyparameter\c!reference  \empty
   \letdummyparameter\c!alternative\empty
   \letdummyparameter\c!before     \empty
   \letdummyparameter\c!after      \empty
   \letdummyparameter\c!lefttext   \empty
   \letdummyparameter\c!righttext  \empty
   \getdummyparameters[#1]%
   \edef\p_reference{\dummyparameter\c!reference}%
   \ifx\p_reference\empty
      \edef\currentbtxcitetag{#2}%
   \else
      \let\currentbtxcitetag\p_reference
      \edef\currentbtxciteuservariables{#2}%
   \fi
   \edef\p_alternative{\dummyparameter\c!alternative}%
   \ifx\p_alternative\empty
     \setbtxparametersetroot\s!cite
     \edef\currentbtxcitealternative{\btxparameter\c!alternative}%
   \else
     \let\currentbtxcitealternative\p_alternative
   \fi
   \setbtxparameterset\s!cite\currentbtxcitealternative
   \setupcurrentbtx[#1]%
   %
   \edef\p_publ_cite_before   {\dummyparameter\c!before}%
   \edef\p_publ_cite_after    {\dummyparameter\c!after}%
   \edef\p_publ_cite_lefttext {\dummyparameter\c!lefttext}%
   \edef\p_publ_cite_righttext{\dummyparameter\c!righttext}%
   %
   \the\everysetupbtxciteplacement
   \publ_cite_variant
   \endgroup}

\def\publ_cite_tags_variants_indeed#1[#2]%
  {\letinteractionparameter\c!style\empty
   \edef\currentbtxcitealternative{#1}%
   \edef\currentbtxcitetag{#2}%
   \setbtxparameterset\s!cite\currentbtxcitealternative
   \the\everysetupbtxciteplacement
   \publ_cite_variant
   \endgroup}

\newconditional\btxcitecompress

\let\currentbtxreference\empty
\let\currentbtxcitemethod\v!hidden

\def\publ_cite_variant
  {\begingroup
   \publ_cite_handle_variant_indeed[\currentbtxcitetag]}

\unexpanded\def\publ_cite_handle_variant#1%
  {\begingroup
   \edef\currentbtxcitealternative{#1}%
   \setbtxparameterset\s!cite\currentbtxcitealternative
   \the\everysetupbtxciteplacement
   \dosingleargument\publ_cite_handle_variant_indeed}

\unexpanded\def\publ_cite_handle_variant_blob
  {\clf_btxhandlecite
     dataset          {\currentbtxdataset}%
     reference        {\currentbtxreference}%
     method           {\currentbtxcitemethod}%
     variant          {\currentbtxcitealternative}%
     sorttype         {\btxparameter\c!sorttype}%
     compress         {\btxparameter\c!compress}%
     author           {\btxparameter\c!author}%
     authorconversion {\c!authorconversion}%
     lefttext         {\p_publ_cite_lefttext}%
     righttext        {\p_publ_cite_righttext}%
     before           {\p_publ_cite_before}%
     after            {\p_publ_cite_after}%
   \relax
   \iftrialtypesetting\else
    %\clf_btxflushmarked
   \fi}

\let\dobtxcitevariantblob\publ_cite_handle_variant_blob % command can use it via lua

\def\publ_cite_handle_variant_indeed[#1]%
  {\letbtxparameter\c!alternative\currentbtxcitealternative
   \edef\currentbtxreference{#1}%
   \usebtxstyleandcolor\c!style\c!color
   \uselanguageparameter\btxdatasetparameter % new
   \btxparameter\c!left
   \btxparameter\c!command{\dobtxcitevariantblob}% {\publ_cite_handle_variant_blob}%
   \btxparameter\c!right
   \endgroup}

\unexpanded\def\btxlistcitation
  {\dontleavehmode
   \begingroup
   \let\currentbtxcitemethod\v!list
   \dodoubleempty\publ_citation}

\unexpanded\def\btxtextcitation
  {\dontleavehmode
   \begingroup
   \let\btxcitereference\relax % a bit of a hack but ok
   \let\currentbtxcitemethod\v!text
   \dodoubleempty\publ_citation}

\unexpanded\def\btxalwayscitation
  {\dontleavehmode
   \begingroup
   \let\currentbtxcitemethod\v!always
   \dodoubleempty\publ_citation}

\def\publ_citation[#1][#2]% could be made more efficient but not now
  {\ifsecondargument
     \publ_cite_tags_options_indeed{#1}[#2]%
   \else
     \publ_cite_tags_indeed{#1}%
   \fi}

\unexpanded\def\btxhiddencitation
  {\dosingleempty\publ_cite_hidden}

\unexpanded\def\publ_cite_hidden[#1]%
  {\iftrialtypesetting \else
     \begingroup
     \let\currentbtxcitemethod\v!hidden
     \edef\currentbtxreference{#1}%
     \clf_btxhandlenocite
       method    {\currentbtxcitemethod}%
       dataset   {\currentbtxdataset}%
       reference {\currentbtxreference}%
     \relax
    %\clf_btxflushmarked
     \endgroup
   \fi}

\unexpanded\def\btxmissing#1%
  {\dontleavehmode{\tttf<#1>}}

%D Compatibility:

\let\hiddencitation\btxhiddencitation  \let\hiddencite\hiddencitation
\let\listcitation  \btxlistcitation    \let\listcite  \listcitation
\let\textcitation  \btxtextcitation    \let\textcite  \textcitation
\let\alwayscitation\btxalwayscitation  \let\alwayscite\alwayscitation

\unexpanded\def\citation  {\doifelsenextoptionalcs\btxlistcitation  \btxdirectlistcite}
\unexpanded\def\nocitation{\doifelsenextoptionalcs\btxhiddencitation\btxdirecthiddencite}

\let\cite  \citation
\let\nocite\nocitation

\unexpanded\def\publ_entry_citation  {\doifelsenextoptionalcs\btxlistcitation  \btxdirectlistcite}
\unexpanded\def\publ_entry_nocitation{\doifelsenextoptionalcs\btxhiddencitation\btxdirecthiddencite}

\appendtoks
    \let\cite  \publ_entry_citation
    \let\nocite\publ_entry_nocitation
\to \everybtxlistrendering

\unexpanded\def\btxdirectlistcite  #1{\btxlistcitation  [#1]\relax} % no optional arguments
\unexpanded\def\btxdirecthiddencite#1{\btxhiddencitation[#1]\relax} % no optional arguments

%D Setup helpers, beware, we need to wrap this .. now we need to know
%D how setups are implemented.

\setvalue{\??setup:\s!btx:\s!unknown}#1{\inframed{\tttf#1}}

\def\publ_fast_setup_yes#1#2%
  {\csname\??setup:\s!btx:%
     \ifcsname\??setup:\s!btx:\currentbtxspecification:#1:#2\endcsname
        \currentbtxspecification:#1:#2%
     \else\ifcsname\??setup:\s!btx:\currentbtxspecificationfallback:#1:#2\endcsname
        \currentbtxspecificationfallback:#1:#2%
     \else\ifcsname\??setup:\s!btx:#1:#2\endcsname
        #1:#2%
     \else\ifcsname\??setup:\s!btx:\currentbtxspecification:#1:\s!unknown\endcsname
        \currentbtxspecification:#1:\s!unknown
     \else\ifcsname\??setup:\s!btx:\currentbtxspecificationfallback:#1:\s!unknown\endcsname
        \currentbtxspecificationfallback:#1:\s!unknown
     \else
        #1:\s!unknown
     \fi\fi\fi\fi\fi
   \endcsname{#2}}

\def\publ_fast_setup_nop#1#2%
  {\csname\??setup:\s!btx:%
     \ifcsname\??setup:\s!btx:\currentbtxspecification:#1:#2\endcsname
        \currentbtxspecification:#1:#2%
     \else\ifcsname\??setup:\s!btx:#1:#2\endcsname
        #1:#2%
     \else\ifcsname\??setup:\s!btx:\currentbtxspecification:#1:\s!unknown\endcsname
        \currentbtxspecification:#1:\s!unknown
     \else
        #1:\s!unknown
     \fi\fi\fi
   \endcsname{#2}}

\newconstant\btxsetuptype

% 0 = unknown   darkred
% 1 = cite      darkblue
% 2 = subcite   darkgreen
% 3 = numbering darkorange
% 4 = list      darkcyan
% 5 = page      darkmagenta
% 6 = unknown   darkred

\unexpanded\def\publ_fast_btx_setup_chain_inbetween
  {\allowbreak->\allowbreak}

\unexpanded\def\publ_fast_btx_setup_colon_inbetween
  {\allowbreak:\allowbreak}

\unexpanded\def\publ_fast_btx_setup_chain_yes#1#2%
  {\dontleavehmode\begingroup
   \let\:\publ_fast_btx_setup_colon_inbetween
   \infofont
   \ifcase\btxsetuptype\darkred\or\darkblue\or\darkgreen\or\darkcyan\or\darkmagenta\else\darkred\fi
   [\prewordbreak
   \currentbtxspecification        \:#1\:#2\ifcsname\??setup:\s!btx:\currentbtxspecification:#1:#2\endcsname\else
   \publ_fast_btx_setup_chain_inbetween
   \currentbtxspecificationfallback\:#1\:#2\ifcsname\??setup:\s!btx:\currentbtxspecificationfallback:#1:#2\endcsname\else
   \publ_fast_btx_setup_chain_inbetween
                                     #1\:#2\ifcsname\??setup:\s!btx:#1:#2\endcsname\else
   \publ_fast_btx_setup_chain_inbetween
   \currentbtxspecification        \:#1\:\s!unknown\ifcsname\??setup:\s!btx:\currentbtxspecification:#1:\s!unknown\endcsname\else
   \publ_fast_btx_setup_chain_inbetween
   \currentbtxspecificationfallback\:#1\:\s!unknown\ifcsname\??setup:\s!btx:\currentbtxspecificationfallback:#1:\s!unknown\endcsname\else
   \publ_fast_btx_setup_chain_inbetween
   unset\fi\fi\fi\fi\fi
   \space @\space
   \currentbtx
   \prewordbreak]%
   \endgroup}

\unexpanded\def\publ_fast_btx_setup_chain_nop#1#2%
  {\dontleavehmode\begingroup
   \let\:\publ_fast_btx_setup_colon_inbetween
   \infofont
   \darkred
   [\prewordbreak
   \currentbtxspecification\:#1\:#2\ifcsname\??setup:\s!btx:\currentbtxspecification:#1:#2\endcsname\else
   \publ_fast_btx_setup_chain_inbetween
                             #1\:#2\ifcsname\??setup:\s!btx:#1:#2\endcsname\else
   \publ_fast_btx_setup_chain_inbetween
   \currentbtxspecification\:#1\:\s!unknown\ifcsname\??setup:\s!btx:\currentbtxspecification:#1:\s!unknown\endcsname\else
   \publ_fast_btx_setup_chain_inbetween
   unset\fi\fi\fi
   \space @\space
   \currentbtx
   \prewordbreak]%
   \endgroup}

\unexpanded\def\publ_fast_btx_setup_normal#1%
  {\btxsetuptype#1\relax
   \ifx\currentbtxspecificationfallback\empty
     \expandafter\publ_fast_setup_nop
   \else
     \expandafter\publ_fast_setup_yes
   \fi}

\unexpanded\def\publ_fast_btx_setup_visual#1#2#3%
  {\btxsetuptype#1\relax
   \ifx\currentbtxspecificationfallback\empty
     \expandafter\publ_fast_btx_setup_chain_nop
   \else
     \expandafter\publ_fast_btx_setup_chain_yes
   \fi{#2}{#3}%
   \ifx\currentbtxspecificationfallback\empty
     \expandafter\publ_fast_setup_nop
   \else
     \expandafter\publ_fast_setup_yes
   \fi{#2}{#3}}

\installtextracker
  {publications.setups}
  {\let\publ_fast_setup\publ_fast_btx_setup_visual}
  {\let\publ_fast_setup\publ_fast_btx_setup_normal}

\let\publ_fast_setup\publ_fast_btx_setup_normal

%D Cite helpers:

\newtoks\everybtxciteentry

\prependtoks
     \setfalse\c_btx_cite_reference_injected
\to \everybtxciteentry

\unexpanded\def\btxcitesetup#1%
  {\the\everybtxciteentry
   \everybtxciteentry\emptytoks % tricky maybe not when subcites
   \publ_fast_setup\plusone\s!cite{#1}}    % no \btxcitereset as we loose dataset and such

\unexpanded\def\btxsubcitesetup#1%
  {\the\everybtxciteentry
   \everybtxciteentry\emptytoks % tricky maybe not when subcites
   \publ_fast_setup\plustwo\s!cite{#1}}    % no \btxcitereset as we loose dataset and such

\appendtoks
    \btx_check_language
\to \everybtxciteentry

\unexpanded\def\btxstartsubcite#1%
  {\begingroup
   \btx_reset_cite % todo: limited set
   \def\currentbtxcitealternative{#1}%
   \setbtxparameterset\s!cite\currentbtxcitealternative
   \usebtxstyleandcolor\c!style\c!color
   \btxparameter\c!left
   \relax}

\unexpanded\def\btxstopsubcite
  {\relax
   \btxparameter\c!right
   \endgroup}

\unexpanded\def\btxstartciterendering[#1]%
  {\begingroup
   \edef\currentbtxcitealternative{#1}%
   \setbtxparameterset\s!cite\currentbtxcitealternative
   \usebtxstyleandcolor\c!style\c!color
   \btxparameter\c!left
   \relax}

\unexpanded\def\btxstopciterendering
  {\relax
   \btxparameter\c!right
   \endgroup}

\let\btxstartciteauthor\begingroup
\let\btxstopciteauthor \endgroup

\unexpanded\def\btxstartcite{\begingroup\btx_reset_cite}
           \let\btxstopcite  \endgroup

%D Whatever helpers:

\unexpanded\def\btxsingularplural#1{\clf_btxsingularorplural{\currentbtxdataset}{\currentbtxtag}{#1}}
\unexpanded\def\btxoneorrange    #1{\clf_btxoneorrange      {\currentbtxdataset}{\currentbtxtag}{#1}}
\unexpanded\def\btxfirstofrange  #1{\clf_btxfirstofrange    {\currentbtxdataset}{\currentbtxtag}{#1}}

\let\btxsingularorplural\btxsingularplural

\stopcontextdefinitioncode

%D Journals

\unexpanded\def\btxloadjournallist [#1]{\clf_btxloadjournallist{#1}}
\unexpanded\def\btxsavejournallist [#1]{\clf_btxsavejournallist{#1}}
\unexpanded\def\btxaddjournal  [#1][#2]{\clf_btxaddjournal{#1}{#2}}
           \def\btxexpandedjournal   #1{\clf_btxexpandedjournal{#1}}    % \unexpanded ?
           \def\btxabbreviatedjournal#1{\clf_btxabbreviatedjournal{#1}} % \unexpanded ?

% \installcorenamespace{btxjournal}
%
% \letvalue{\s!btxjournal\v!long  }\btxexpandedjournal
% \letvalue{\s!btxjournal\v!short }\btxabbreviatedjournal
% \letvalue{\s!btxjournal\v!normal}\firstofoneargument
%
% \unexpanded\def\btxcheckedjournal
%   {\expandnamespaceparameter\s!btxjournal\btxrenderingparameter\c!journalconversion}

% \btxloadjournallist[list.txt] % Foo Journal of Bars = FBJ \n ....
%
% \btxexpandedjournal[fbj]
% \btxabbreviatedjournal[foo journal of bars]

%D Saving data:

\unexpanded\def\savebtxdataset
  {\dotripleargument\publ_save_dataset}

\unexpanded\def\publ_save_dataset[#1][#2][#3]%
  {\ifthirdargument
     \publ_save_dataset_indeed[#1][#2][#3]%
   \else\ifsecondargument
     \doifelseassignment{#2}%
       {\publ_save_dataset_indeed[\s!default][#1][#2]}%
       {\publ_save_dataset_indeed[#1][#2][]}%
   \else\iffirstargument
     \doifelseassignment{#1}%
       {\publ_save_dataset_indeed[\s!default][\jobname-saved.bib][#1]}%
       {\publ_save_dataset_indeed[\s!default][#1][]}%
 % \else
 %   % bad news
   \fi\fi\fi}

\unexpanded\def\publ_save_dataset_indeed[#1][#2][#3]%
  {\begingroup
   \getdummyparameters
     [\c!criterium=\v!all,%
      \c!type=,%
      \c!dataset=#1,%
      \c!file=#2,%
      #3]% % all or used
   \clf_btxsavedataset
     dataset   {\dummyparameter\c!dataset}%
     filename  {\dummyparameter\c!file}%
     filetype  {\dummyparameter\c!type}%
     criterium {\dummyparameter\c!criterium}%
   \relax
   \endgroup}

% \savebtxdataset[default][e:/tmp/foo.bib]
% \savebtxdataset[default][e:/tmp/foo.lua]
% \savebtxdataset[default][e:/tmp/foo.xml]

%D In-text entries:

\unexpanded\def\placecitation{\citation[entry]} % [#1]

\unexpanded\def\btxhandleciteentry
  {\dontleavehmode
   \begingroup
   \def\currentbtxcitealternative{entry}%
   \setbtxparameterset\s!cite\currentbtxcitealternative % needs checking
   \btxcitereference
   \btx_entry_inject
   \endgroup}

%D Registers

% \setupbtxregister
%   [\c!state=\v!start,
%    \c!dataset=\v!all,
%    \c!method=\v!always]

\unexpanded\def\publ_registers_set
  {\ifx\currentbtxregister\empty \else
     \clf_btxsetregister
        specification {\currentbtxspecification}%
        name          {\currentbtxregister}%
        state         {\btxregisterparameter\c!state}%
        dataset       {\btxregisterparameter\c!dataset}%
        field         {\btxregisterparameter\c!field}%
        register      {\btxregisterparameter\c!register}%
        method        {\btxregisterparameter\c!method}%
        alternative   {\btxregisterparameter\c!alternative}%
     \relax
  \fi}

\appendtoks
    \publ_registers_set
\to \everydefinebtxregister

\appendtoks
    \publ_registers_set
\to \everysetupbtxregister

\appendtoks
    \normalexpanded{%
      \defineprocessor
        [\s!btx:r:\currentbtxregister]%
        [\c!style=\noexpand\namedbtxregisterparameter{\currentbtxregister}\noexpand\c!style,
         \c!color=\noexpand\namedbtxregisterparameter{\currentbtxregister}\noexpand\c!color]}%
\to \everydefinebtxregister

\appendtoks
    \clf_btxtoregister{\currentbtxdataset}{\currentbtxtag}%
\to \t_btx_reference_inject

\unexpanded\def\btxindexedauthor#1#2#3#4#5#6% alternative von last initials first junior
  {\begingroup
   \def\currentbtxcitealternative{#1}%
   \ifx\currentbtxcitealternative\empty
      \edef\currentbtxcitealternative{invertedshort}% maybe we need some default here too?
   \fi
   %let\currentbtxlistvariant\currentbtxcitealternative % we inherit
   \the\everysetupbtxciteplacement
   \def\currentbtxvons       {#2}%
   \def\currentbtxsurnames   {#3}%
   \def\currentbtxinitials   {#4}%
   \def\currentbtxfirstnames {#5}%
   \def\currentbtxjuniors    {#6}%
   \setbtxparameterset\s!cite\currentbtxcitealternative
   \fastsetup{\s!btx:\s!cite:\s!author:\currentbtxcitealternative}%
   \endgroup}

\unexpanded\def\btxregisterauthor
  {\doifelsenextoptionalcs\publ_register_author_yes\publ_register_author_nop}

\def\publ_register_author_yes[#1]#2%
  {\clf_btxauthortoregister{#1}{#2}\relax}

\def\publ_register_author_nop#1%
  {\clf_btxauthortoregister{\currentbtxdataset}{#1}\relax}


%D We hook some setters in the definition sets:

% \installdefinitionsetmember \??btx {btxspecification} \??btxcitevariant {btxcitevariant}
% \installdefinitionsetmember \??btx {btxspecification} \??btxlistvariant {btxlistvariant}
% \installdefinitionsetmember \??btx {btxspecification} \??btxlist        {btxlist}
% \installdefinitionsetmember \??btx {btxspecification} \??btxrendering   {btxrendering}
% \installdefinitionsetmember \??btx {btxspecification} \??btx            {btx}

%D And more helpers ... a never ending story these publications:

% \definebtx
%   [btx:apa:list:article:title]
%   [style=bolditalic,
%    command=\WORD]
%
% \btxstartstyle[btx:apa:list:article:title]
%     \btxusecommand[btx:apa:list:article:title]{foo}
% \btxstopstyle

\let\savedcurrentbtx\empty

\unexpanded\def\btxstartstyle[#1]%
  {\begingroup
   \let\savedcurrentbtx\currentbtx
   \def\currentbtx{#1}%
   \usebtxstyle\c!style
   \let\currentbtx\savedcurrentbtx}

\unexpanded\def\btxstartcolor[#1]%
  {\begingroup
   \let\savedcurrentbtx\currentbtx
   \def\currentbtx{#1}%
   \usebtxcolor\c!color
   \let\currentbtx\savedcurrentbtx}

\unexpanded\def\btxstartstyleandcolor[#1]%
  {\begingroup
   \let\savedcurrentbtx\currentbtx
   \def\currentbtx{#1}%
   \usebtxstyleandcolor\c!style\c!color
   \let\currentbtx\savedcurrentbtx}

\let\btxstopstyle        \endgroup
\let\btxstopcolor        \endgroup
\let\btxstopstyleandcolor\endgroup

\unexpanded\def\btxusecommand[#1]#2% using #2 permits space after []
  {\namedbtxparameter{#1}\c!command{#2}}

%D Defaults:

\setupbtxrendering
  [\c!interaction=\v!start, % \v!all
   \c!specification=\btxparameter\c!specification,
   \c!dataset=\v!default,
   \c!repeat=\v!no,
   \c!continue=\v!no,
   \c!method=\v!global,
 % \c!setups=btx:\btxrenderingparameter\c!alternative:initialize, % not the same usage as cite !
   \c!sorttype=\v!default,
   \c!criterium=\v!text,
   \c!refcommand=authoryears,  % todo
   \c!numbering=\v!yes,
  %\c!saveinlist=\v!no, % maybe for before/after
   \c!pagestate=\v!stop,
   \c!textstate=\v!start,
   \c!width=\v!auto,
   \c!separator={\btxsemicolon},
   \c!distance=1.5\emwidth]

% Quite some interpunction and labels are the same of at least consistent within
% a standard when citations and list entries are involved. We assume that each
% standard defines its own set but it can fall back on these defaults.

\setupbtx
  [\c!interaction=\v!start,
   \c!alternative=num, % default cite form, normally defined in the cite namespace
   \c!inbetween=\btxspace,
 % \c!range=\endash,   % separator:range?
   \c!range=\directdiscretionary\endash,
   \c!compress=\v!yes, % was no?
   \c!authorconversion=normal,
   \c!sorttype=normal, % normal, reverse or none
   \c!etallimit=3,
   \c!etaldisplay=\btxparameter\c!etallimit,
   \c!otherstext={\btxspace et al.},
   \c!separator:firstnames={\btxspace},
   \c!separator:juniors={\btxspace},
   \c!separator:vons={\btxspace},
   \c!separator:initials={\btxspace},
   \c!stopper:initials={.},
  %\c!surnamesep={\btxcomma}, % is this used anywhere?
   \c!separator:invertedinitials={\btxcomma},
   \c!separator:invertedfirstnames={\btxcomma},
   \c!separator:names:2={\btxcomma}, % separates multiple names
   \c!separator:names:3=\btxparameter{\c!separator:2}, % before last name in a list
   \c!separator:names:4=\btxparameter{\c!separator:2}, % between only two names
   \c!separator:2={\btxsemicolon}, % aka pubsep - separates multiple objects
   \c!separator:3=\btxparameter{separator:2}, % before last object in a list
   \c!separator:4=\btxparameter{separator:2}] % between only two objects

% Do we want these in the format? Loading them delayed is somewhat messy.

\loadbtxdefinitionfile[commands]
\loadbtxdefinitionfile[definitions]

\loadbtxdefinitionfile[cite]
\loadbtxdefinitionfile[list]
\loadbtxdefinitionfile[page]
\loadbtxdefinitionfile[author]

% we assume that the users sets up the right specification and if not ... well,
% hope for the best that something shows up and consult the manual otherwise

\unexpanded\def\usebtxdefinitions[#1]%
  {\loadbtxdefinitionfile[#1]%     % for hh
   \setupbtx[\c!specification=#1]} % for ab

\setupbtx
  [\c!specification=\s!default,
   \c!dataset=\v!default,
   \c!default=\v!default]

\loadbtxdefinitionfile
  [\s!default]

\protect