-Idclass::accessor () {\
- accessed_b_ = true;\
- return (Class*)data_p_->clone();\
-}
-
-#define IMPLEMENT_ID_CLASS(Idclass, Class, accessor) \
- IMPLEMENT_IS_TYPE_B1(Idclass,Identifier)\
- Idclass::~Idclass() { delete data_p_; }\
- Idclass::Idclass (Class*st, int code):Identifier (code) { data_p_ = st; }\
-
-IMPLEMENT_ID_CLASS(Duration_id, Duration, duration);
-IMPLEMENT_ID_CLASS(Translator_id, Translator, translator);
-IMPLEMENT_ID_CLASS(Int_id, int, intid);
-IMPLEMENT_ID_CLASS(Real_id, Real, real);
-IMPLEMENT_ID_CLASS(Script_id, General_script_def, script);
-IMPLEMENT_ID_CLASS(Lookup_id, Lookup, lookup);
-IMPLEMENT_ID_CLASS(Symtables_id, Symtables, symtables);
-IMPLEMENT_ID_CLASS(Music_id, Music, music);
-IMPLEMENT_ID_CLASS(Score_id, Score, score);
-IMPLEMENT_ID_CLASS(Request_id, Request, request);
-IMPLEMENT_ID_CLASS(Midi_def_id, Midi_def, mididef);
-IMPLEMENT_ID_CLASS(Paper_def_id, Paper_def, paperdef);
-
-Identifier::Identifier (Identifier const&)
+Class ## _identifier::access_content_ ## Class (bool copy_b) const{\
+ ((Class ## _identifier*)this)->accessed_b_ = true;\
+ return copy_b ? dynamic_cast<Class*> (data_p_->clone()) : data_p_;\
+}
+
+#define IMPLEMENT_ID_CLASS(Class) \
+ Class ## _identifier::~Class ## _identifier() { delete data_p_; }\
+ Class ## _identifier::Class ## _identifier (Class*st, int code) \
+ :Identifier (code)\
+ {\
+ data_p_ = st;\
+ }\
+Class ## _identifier::Class ## _identifier (Class ## _identifier const &s) \
+ : Identifier (s)\
+{\
+ data_p_ = s.access_content_ ## Class (true);\
+}
+
+
+IMPLEMENT_ID_CLASS(Duration);
+IMPLEMENT_ID_CLASS(Translator_group);
+IMPLEMENT_ID_CLASS(Music);
+IMPLEMENT_ID_CLASS(Score);
+IMPLEMENT_ID_CLASS(Request);
+IMPLEMENT_ID_CLASS(Music_output_def);
+VIRTUAL_ACCESSOR(Music);
+VIRTUAL_ACCESSOR(Request);
+VIRTUAL_ACCESSOR(Translator_group);
+VIRTUAL_ACCESSOR(Music_output_def);
+DEFAULT_ACCESSOR(Duration);
+DEFAULT_ACCESSOR(Score);
+
+
+int
+Identifier::print_smob (SCM s, SCM p, scm_print_state*)
+{
+ return 1;
+}
+
+SCM
+Identifier::mark_smob (SCM s)