SCM internal_get_property (SCM name_sym) const;
SCM properties_as_alist () const;
Context *where_defined (SCM name_sym, SCM *value) const;
+ bool here_defined (SCM name_sym, SCM *value) const;
void unset_property (SCM var_sym);
void instrumented_set_property (SCM, SCM, const char *, int, const char *);
Context *get_voice_to_lyrics (Context *lyrics);
Grob *get_current_note_head (Context *voice, bool include_grace_notes);
Grob *get_current_rest (Context *voice);
-DECLARE_UNSMOB (Context, context);
Moment measure_position (Context const *context);
Moment measure_position (Context const *context, Duration const *dur);