At 21:45 02/06/2004, you wrote:

I'd prefer (at least a variant) that does it based on fontstyle as well:

\unprotect

\definesystemvariable{sx}

\def\definestylecollection
   {\dotripleargument\dodefinestylecollection}

\def\dodefinestylecollection[#1][#2][#3][#4]%
   {\unexpanded\setvalue{#1}{\styleinstance[#1]}%
    \setvalue{\??sx#1:#2:#3}{#4}}

\unexpanded\def\styleinstance[#1]%
   {\executeifdefined{\??sx#1:\fontstyle:\fontalternative}{\getvalue{\?
?sx#1:\fontstyle:\s!default}}}

\protect
\definestylecollection[caps][ss][default][\sc]
\definestylecollection[caps][ss][bf][\bc]
\definestylecollection[caps][ss][bi][\bc]
\definestylecollection[caps][ss][bs][\bc]

% \definestylecollection[mine]

% \definestyleinstance[mine][default][sorry]
% \definestyleinstance[mine][tt][bs][ttbs:\rm\sl]
% \definestyleinstance[mine][tt][bf][ttbf:\rm\sl]
% \definestyleinstance[mine][bf][\sl]
% \definestyleinstance[mine][sl][\tt]

% {\bf test \mine test \sl test \mine test \bs oeps \mine oeps {\tt test \mine \bf test}}

\definesystemvariable{sx}

\def\definestylecollection
  {\dosingleargument\dodefinestylecollection}

\def\dodefinestylecollection[#1]%
  {\iffirstargument
     \unexpanded\setvalue{#1}{\styleinstance[#1]}%
     \def\docommand##1%
       {\def\dodocommand####1{\letbeundefined{\??sx##1:####1:\commalistelement}}%
        \processcommacommand[\alternativelist,\s!default]\dodocommand}%
     \processcommacommand[\stylelist,\s!default]\docommand
   \fi}

\def\definestyleinstance
  {\doquadrupleargument\dodefinestyleinstance}

\def\dodefinestyleinstance[#1][#2][#3][#4]% [name] [rm|ss|tt|..] [sl|bf|...] [whatever]
{\iffirstargument
\doifundefined{#1}{\definestylecollection[#1]}%
\fi
\iffourthargument
\setvalue{\??sx#1:#2:#3}{#4}%
\else\ifthirdargument
\setvalue{\??sx#1::#2}{#3}%
\else\ifsecondargument
\letvalue{\??sx#1::#2}\empty
\fi\fi\fi}


\unexpanded\def\styleinstance[#1]% will be faster
  {%\begingroup\expanded{\infofont[#1:\fontstyle:\fontalternative]}\endgroup
   \executeifdefined{\??sx#1:\fontstyle:\fontalternative}%
  {\executeifdefined{\??sx#1:\fontstyle:\s!default}%
  {\executeifdefined{\??sx#1::\fontalternative}
  {\getvalue        {\??sx#1::\s!default}}}}}

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