Google Base offers a number of pre-defineditem types, with recommended attributes for each.
Google Base提供很多预定义的条目类型,每种类型都有一些推荐的属性。
2
In this case, a global item class can be defined for the connector, to serve as a way to retrieve those properties that can always be accessed.
在这种情况下,可以为连接器定义一个全局项目类,作为对那些一直可以进行访问的属性进行检索的方法。
3
Figure 10 shows a relationship between line items in which one of the roles is defined for a line item that is unique only within the Order that contains it.