Predicate is another common form of query expression that evaluates to either true or false.
Predicate是计算结果为true或false的常见查询表达式形式。
It is here, though, that a common question is asked: How do you write the query expression to get the correct node from an arbitrarily complex DOM?
但是，这里经常有人提问这样一个问题：如何编写查询表达式才能从任何复杂的DOM中获取正确的节点？
One such example is when the pushed down query is a common sub-expression.
一个例子就是被下推的查询是一个公共子表达式。
Navigating XML queries by path expression is the common characteristic of XML query languages.
利用路径表达式导航XML查询是XML查询语言的共同特点。
Path expression is a common feature of XML query languages. Many indexing methods have been proposed.
路径查询是XML查询的一个主要特征，现已提出了多种XML索引方法。
Path expression is a common feature of XML query languages. Many indexing methods have been proposed.
路径查询是XML查询的一个主要特征，现已提出了多种XML索引方法。
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