+ Grob *me = unsmob<Grob> (smob);
+ vector<Grob *> footnotes;
+ SCM grobs_scm = Grob_array::make_array ();
+ extract_grob_set (me, "all-elements", elts);
+ for (vsize i = 0; i < elts.size (); i++)
+ if (elts[i]->internal_has_interface (ly_symbol2scm ("footnote-interface")))
+ footnotes.push_back (elts[i]);
+
+ unsmob<Grob_array> (grobs_scm)->set_array (footnotes);
+ return grobs_scm;
+}
+
+MAKE_SCHEME_CALLBACK (System, footnotes_after_line_breaking, 1);
+SCM
+System::footnotes_after_line_breaking (SCM smob)
+{
+ Spanner *sys_span = unsmob<Spanner> (smob);
+ System *sys = dynamic_cast<System *> (sys_span);
+ Interval_t<int> sri = sys->spanned_rank_interval ();
+ vector<Grob *> footnote_grobs = sys->get_footnote_grobs_in_range (sri[LEFT], sri[RIGHT]);
+ vector_sort (footnote_grobs, grob_2D_less);
+
+ SCM grobs_scm = Grob_array::make_array ();
+ unsmob<Grob_array> (grobs_scm)->set_array (footnote_grobs);
+ return grobs_scm;
+}
+
+MAKE_SCHEME_CALLBACK (System, vertical_skyline_elements, 1);
+SCM
+System::vertical_skyline_elements (SCM smob)
+{
+ Grob *me_grob = unsmob<Grob> (smob);
+ vector<Grob *> vertical_skyline_grobs;
+ extract_grob_set (me_grob, "elements", my_elts);
+ for (vsize i = 0; i < my_elts.size (); i++)
+ if (has_interface<System_start_delimiter> (my_elts[i]))
+ vertical_skyline_grobs.push_back (my_elts[i]);
+
+ System *me = dynamic_cast<System *> (me_grob);
+ Grob *align = unsmob<Grob> (me->get_object ("vertical-alignment"));
+ if (!align)
+ {
+ SCM grobs_scm = Grob_array::make_array ();
+ unsmob<Grob_array> (grobs_scm)->set_array (vertical_skyline_grobs);
+ return grobs_scm;
+ }
+
+ extract_grob_set (align, "elements", elts);
+
+ for (vsize i = 0; i < elts.size (); i++)
+ if (has_interface<Hara_kiri_group_spanner> (elts[i]))
+ vertical_skyline_grobs.push_back (elts[i]);
+
+ SCM grobs_scm = Grob_array::make_array ();
+ unsmob<Grob_array> (grobs_scm)->set_array (vertical_skyline_grobs);
+ return grobs_scm;