+property.
+
+In combination with (span) bar lines, it is a string resembling the
+bar line appearance in ASCII form.")
+ (glyph-name ,string? "The glyph name within the font.
+
+In the context of (span) bar lines, @var{glyph-name} represents
+a processed form of @code{glyph}, where decisions about line breaking
+etc. are already taken.")