返回一段永久XML交易数据的样例查询。
Sample query returning a fragment of persistent XML trade data.
此外，我们的样例查询通过在where子句中指定关系谓词和xml谓词，限定了所关注的行。
In addition, our sample query qualifies the rows of interest by specifying relational and XML predicates in the WHERE clause.
清单9显示了另一个样例查询，它确定的是不同的原子(或离子)在不同的化合物中发生的频率。
Listing 9 shows another sample query, which determines how often different atoms - or ions - occur in different compounds.
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