选择一个其兄弟姐妹包含属性XML的元素

Question

I'm trying to select the title value where the attribute value is greater than 1:

path="//book/price[@value >1]

I'm not exactly sure how to select only the titles where the attribute value for the element price is greater than one. I'm an XML beginner and I'm doing a few exercises from a tutorial.

My priorities are

1. learning XML
2. super XML

XML:

<bookstore>
<book>
  <title lang="en">Harry Potter</title>
  <price value="1">49.99</price>
</book>
<book>
 <title lang="en">Learning XML</title>
 <price value="2">29.95</price>
</book>
<book>
  <title lang="en">super xml</title>
  <price value="3">39.95</price>
</book>
</bookstore>

Update

The first query was perfect could you show me how to obtain it from a nested element?

<bookstore>
<book>
  <title lang="en">Harry Potter</title>
  <possibleprice>
     <price value="1">49.99</price>
  </possibleprice>
</book>
<book>
  <title lang="en">Learning XML</title>
  <possibleprice>
     <price value="2">29.95</price>
  </possibleprice>
</book>
<book>
  <title lang="en">super xml</title>
  <possibleprice>
    <price value="3">39.95</price>
  </possibleprice>
</book>
</bookstore>

Answer 1

For example:

For the first version of the OP:

Input:

<bookstore>
<book>
  <title lang="en">Harry Potter</title>
  <price value="1">49.99</price>
</book>
<book>
 <title lang="en">Learning XML</title>
 <price value="2">29.95</price>
</book>
<book>
  <title lang="en">super xml</title>
  <price value="3">39.95</price>
</book>
</bookstore>

XPath:

//book/price[@value > 1]/preceding-sibling::title

Result:

<title lang="en">Learning XML</title>
<title lang="en">super xml</title>

For the updated second XML version of OP, as different example:

XPath:

//book/possibleprice/price[@value > 1]/ancestor::book/title

Same result as above.

To answer the question in the comment if it would be necessary to use preceding-sibling twice for the 2nd version: no. preceding-sibling targets the preceding-sibling of the current node. The current node in this case is price and has no siblings, but the parent possibleprice . To get the same result in a different way as given above, it would be possible to get the parent of price and then the preceding-sibling of possibleprice :

//book/possibleprice/price[@value > 1]/parent::possibleprice/preceding-sibling::title

which results in the same.

As mentioned that OP is a beginner in XML, maybe the following can be useful to illustrate XPath axes: http://www.xmlplease.com/axis