Hi, there is a mix of named and numbered parameters (which just looks odd) in the defintion of the following two command. \unexpanded\def\font_feature_yes[#method]{\csname\??featureyes\ifcsname\??featureyes#1\endcsname#1\else\s!unknown\fi\endcsname} \unexpanded\def\font_feature_nop #method{\csname\??featurenop\ifcsname\??featurenop#1\endcsname#1\else\s!unknown\fi\endcsname} Wolfgang