This document also includes a section for composite data elements. Multiple pieces of related data can be combined in order to create a single composite element. There are three ways to create a composite data element: sequences, repetitions and optional elements. Sequencing primitive data states the elements are always in the same order. For example, a customer’s name is First Name, Middle Initial, and Last Name. A repeating pattern is when a certain element is repeated in the composite. An optional element composite includes primitive elements that may or may not exist in the composite structure. For example, a sales receipt typically includes order number, date, time, product identifier, quantity, price, subtotal, sales tax, and total. However, some receipts may not include sales tax for tax exempt organizations