virtual int copy_derived(int64_t start, int64_t end, FileXML *file) { return 0; };
virtual int paste_derived(int64_t start, int64_t end,
int64_t total_length, FileXML *file, int ¤t_channel) { return 0; };
virtual int copy_derived(int64_t start, int64_t end, FileXML *file) { return 0; };
virtual int paste_derived(int64_t start, int64_t end,
int64_t total_length, FileXML *file, int ¤t_channel) { return 0; };