A predicate is a partial expression that can be applied to an existing node set.
谓词是用于已有节点集的部分表达式。
The replace expression is used to update a particular value of a particular node.
replace表达式用来更新特定节点的特定值。
If the expression is true, the node is added to the results.
如果表达式为true，节点就添加到结果中。
If the expression is true, the node is added to the results.
如果表达式为true，节点就添加到结果中。
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