optimizing path expression queries of xml data

target node aimed path expression processing for xml data

以目标节点为导向的XML路径查询处理

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optimize query of path expression on the basis of matched-pattern

基于模式匹配的路径表达式查询优化

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the following flwor expression will select exactly the same as the path expression above

下述FLWOR表达式和上述路径表达式选择的值相同

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jet tags requiring a path expression have a select attribute.

需要路径表达式的JET标签有一个select属性。

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in addition, any path expression of the url is ignored.

此外，URL中的任何路径表达式都将被忽略。

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p. get(person_. age) is a path expression.

get（Person_.age）是一个路径表达式。

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the problem of low query efficiency based on path expression was well solved with dual index strategy.

双重索引策略很好地解决了基于路径表达式查询效率低的问题。

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this is because the path expression in the query targets only elements that have no namespaces.

这是因为该查询中的路径表达式仅指向没有名称空间的元素。

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whatever names they use, they all match the path expression based on their substitution group head element.

不管使用哪个名称，它们都匹配基于它们的代替组head元素的路径表达式。

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note that the path expression is case-sensitive.

注意，路径表达式是大小写敏感的。

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to deal with the tree-like and semi-structured style of xml documents, definitions are given based on path expression.

为适应XML文档特有的树型结构和半结构化特征，文章采用基于路径的表示方法。

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a path expression is similar to a filesystem path.

路径表达式与文件系统路径相似。

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in the following example, the path expression in the query body does not specify a namespace prefix.

在下面的示例中，查询主体中的路径表达式没有指定命名空间前缀。

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a path expression in xquery consists of a series of steps, separated by slash characters.

XQuery中的路径表达式由一系列的“步（step）”组成，之间以斜杠隔开。

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in many cases, it is possible to write a query by using either a flwor expression or a path expression.

在很多情况下，可以任意使用FLWOR表达式或路径表达式编写查询。

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hence p. get(person_. age) denotes a path expression by navigating from the root expression p by the age attribute of person.

因此，表达式p.get（Person_.age）表示使用Person的age属性从根表达式p导航。

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a query on a context node that uses an absolute path expression will start on the root node of the context node .

对使用绝对路径表达式的上下文节点的查询，将从上下文节点的根节点开始进行。

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a path expression is the result of navigation from a root expression via one or more persistent attribute(s).

路径表达式是通过一个或多个持久化属性从根表达式进行导航得到的结果。

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as we have seen in the previous chapters, we are selecting and filtering elements with either a path expression or with a flwor expression.

如同在前几章里所看到的，我们用路径表达或FLWOR表达式选择和过滤元素。

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the query shown in listing 5 could be expressed somewhat more concisely as a three-step path expression, as shown in listing 7.

清单3中显示的查询也可以用一种更简单的三步路径表达式来表达，如清单5所示

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