Data items in the STRUCT_SHEET_ORDER category record details about the order of the residue ranges that form a beta-sheet. All order links are pairwise and the specified pairs are assumed to be adjacent to one another in the sheet. These data items are an alternative to the STRUCT_SHEET_TOPOLOGY data items and they allow all manner of sheets to be described.
loop_ _struct_sheet_order.sheet_id _struct_sheet_order.range_id_1 _struct_sheet_order.range_id_2 _struct_sheet_order.offset _struct_sheet_order.sense sheet_1 strand_a strand_b +1 parallel sheet_1 strand_b strand_c +1 parallel sheet_1 strand_c strand_d +1 parallel sheet_1 strand_d strand_e +1 parallel sheet_1 strand_e strand_f +1 parallel sheet_1 strand_f strand_g +1 parallel sheet_1 strand_g strand_h +1 parallel sheet_1 strand_h strand_a +1 parallel
loop_ _struct_sheet_order.sheet_id _struct_sheet_order.range_id_1 _struct_sheet_order.range_id_2 _struct_sheet_order.offset _struct_sheet_order.sense sheet_2 strand_a strand_b +1 anti-parallel sheet_2 strand_b strand_c +1 parallel sheet_2 strand_c strand_d1 +1 anti-parallel sheet_2 strand_c strand_d2 +1 anti-parallel sheet_2 strand_d1 strand_e +1 anti-parallel sheet_2 strand_d2 strand_e +1 anti-parallel