使用XPath访问评论一个扁平的hierachy

问题描述

我有一个给定的XML文档（结构不能更改），并想获得在节点上面写的注释。文档如下所示：

I have a given XML document (structure can not be changed) and want to get the comments that are written above the nodes. The document looks like this:

<!--Some comment here-->    
    <attribute name="Title">Book A</attribute>
    <attribute name="Author">
       <value>Joe Doe</value>
       <value>John Miller</value>
    </attribute>
<!--Some comment here-->
    <attribute name="Code">1</attribute>

所以注释是可选的，但如果有一个，我想获得每个属性上面的注释。
使用 / * / comment（）[n] 会给我注释n，但是对于n = 2我自然会得到第三个属性的注释，有没有属性和评论之间的任何想法？
感谢

So comments are optional, but if there is one, I want to get the comment above each attribute. Using /*/comment()[n] would give me comment n, but for n=2 I would naturally get the comment of the third attribute, so there is no connection between attributes and comments Any ideas?Thanks

推荐答案

使用：

//comment()[following-sibling::*[1][self::attribute]]

这比当前选择的答案更紧凑和精确。 // 缩写是必要的，因为未提供格式良好的XML文档，并且注释节点的嵌套级别未知。

This is more compact and precise than the currently selected answer. The // abbreviation is necessary, since no wellformed XML document was provided and the nesting level of the comment nodes is not known.

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