Hi, \def\font_styles_define_style_instance[#instance][#2][#3][#4]% [name] [rm|ss|tt|..] [sl|bf|...] [whatever] {\iffirstargument - \ifcsname#1\endcsname\else\font_styles_define_style_collection[#instance]\fi + \ifcsname#instance\endcsname\else\font_styles_define_style_collection[#instance]\fi \fi \iffourthargument \setvalue{\??stylecollection#instance:#2:#3}{#4}% \else\ifthirdargument \setvalue{\??stylecollection#instance::#2}{#3}% \else\ifsecondargument \letvalueempty{\??stylecollection#instance::#2}% \fi\fi\fi} Wolfgang