Examples Attributes are omitted to simplify the diagram for now. A SUPPLIER may supply many ITEMS (by "may supply," we mean the supplier may not supply any items). Each ITEM is supplied by any number of SUPPLIERS (by "is supplied," we mean that the item must be supplied by at least one supplier). Examples Attributes are omitted to simplify the diagram for now. A SUPPLIER may supply many ITEMS (by "may supply," we mean the supplier may not supply any items). Each ITEM is supplied by any number of SUPPLIERS (by "is supplied," we mean that the item must be supplied by at least one supplier)