Re: manual needs help with ancient notation

[Juergen Reuter]

Hi, Graham!

> ...
> programming error: Grob `NoteHead' has no interface for property 
> `delta-pitch'
> Continuing; crossing fingers
> ...

These errors are annoying, but harmless.  Ancient notation uses a couple 
of internal variables that need to survive different stages of compiling.  
It currently stores them as properties along with the grobs that it 
creates.  To supress the error messages, one could make these properties 
public (IIRC they originally were public) by declaring them with the 
ADD_INTERFACE macro and listing them in the proper scm/*.scm files.  
However, then they also go into the documentation, which does not make 
sense, because these internal variables are not intended to be touched by 
the user.

Greetings,
Jürgen