xmlstarlet为什么不选择所有节点？ [英] Why doesn't xmlstarlet select all nodes?

问题描述

考虑来自w3schools的示例：

<?xml version="1.0" encoding="ISO-8859-1"?>

<bookstore>

<book category="COOKING">
  <title lang="en">Everyday Italian</title>
  <author>Giada De Laurentiis</author>
  <year>2005</year>
  <price>30.00</price>
</book>

<book category="CHILDREN">
  <title lang="en">Harry Potter</title>
  <author>J K. Rowling</author>
  <year>2005</year>
  <price>29.99</price>
</book>

<book category="WEB">
  <title lang="en">XQuery Kick Start</title>
  <author>James McGovern</author>
  <author>Per Bothner</author>
  <author>Kurt Cagle</author>
  <author>James Linn</author>
  <author>Vaidyanathan Nagarajan</author>
  <year>2003</year>
  <price>49.99</price>
</book>

<book category="WEB">
  <title lang="en">Learning XML</title>
  <author>Erik T. Ray</author>
  <year>2003</year>
  <price>39.95</price>
</book>

</bookstore>

xmlstarlet sel -t -v // @类别
books.xml

xmlstarlet sel -t -v "//@category" books.xml

仅返回烹饪。

BONUS问题：如何在不通过编辑器或程序的情况下不针对XML文件打开XPath查询（我想要一个快速的工具） ）。问题是将大文件加载到内存会使编辑器崩溃。

BONUS question: how do I evaluate XPath queries against an XML file without opening it in an editor nor program (I want a quick tool). The issue is that loading the huge file into memory crashes the editor. Don't tell me that eXist is my best bet?

推荐答案

这是您需要的吗？

xml sel -t -m "//@category" -v "." -o " " books.xml

或在每行中分隔结果

xml sel -t -m "//@category" -v "." -n books.xml

更新

您是对的，您的XPath很好，只需要其他参数即可。

You're right, your XPath was good, you just need different parameters.

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