也就是说，当循环访问属性时，所见到的属性顺序与它们的添加顺序相同。
That is, when you iterate through the attributes, you see them in the same order that they were added.
由于一个业务对象的属性顺序不同，并具有与另一个业务对象的属性不同的名称，就会出现不匹配。
A mismatch could occur because the attributes of one business object are in a different order and have different names than the attributes of the other business object.
全局索引保留来自索引扫描的顺序属性，这是相对于本地索引的一个优势。
Global indexes preserve the order property from index scans, and this gives them an edge over local indexes.
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