求翻译：The most generally accepted communication standards are ANS X. 12 (American National Standards Committee X.12) and UNIEDIFACT (United Nations/Electronic Data Interchange for Administration, Commerce, and Transport). X.12 is promoted as the U. S. standard, while EDIFACT is promoted by the United Nations as more of a global standard. Each organization has defined a structure for exchanging common data between supply chain partners. Experts indicate that the most likely migration path is to EDIFACT standard. Table 7-3 illustrates the difference between paper and electronic communications. The left side of the table illustrates the line item detail necessary to communicate a four-line order. The specific data include the quantity, unit-of-measure, item number, description, and unit price. The table's right side illustrates the information in coded form with field separators. Note that this approach is limited as fields must be transferred in a commonly accepted and understood sequence because the X. 12format does not include a variable definition. Lack of consistency in variable definition and interpretation has further reduced the adoption rate for ED1 and motivated the advancement of XML, a flexible computer language discussed later in this chapter.是什么意思？

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