If not for this small optimization, we would go through every element twice.

如果不是由于这个小小的优化，我们将遍历每个元素两次。

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In the example in Listing 19, the IXAND element in the optimization guideline specifies that the table SECURITY should be accessed using all applicable relational and XML indexes.

在清单19的示例中，优化准则中的IXAND元素指定使用所有合适的关系和xml索引访问表security。

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In the example in Listing 18, the IXAND element in the optimization guideline specifies that the table SECURITY should be accessed using two XML indexes, SEC_INDUSTRY and SEC_SYMBOL.

在清单18的示例中，优化准则中的IXAND元素指定应当使用两个xml索引sec _ INDUSTRY和SEC_SYMBOL访问表security。

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