使用 xmlstarlet 的 XML 文件中的条件 [英] Conditionals in XML file using xmlstarlet

问题描述

考虑此处和这里，我已经改变了它们来解释我的问题.现在代码看起来像这样:

Considering the codes in here and here, I've changed them to explain my question. Now the code looks like this:

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

<bookstore>
<book category="COOKING">
  <Description>
    <title lang="en">Everyday Italian</title>
    <author>Giada De Laurentiis</author>
    <year>2005</year>
    <stock>YES</stock>
  </Description>
  <Location>
    <restock>UMG</restock>
    <shelf>30</shelf>
  </Location>
</book>

<book category="CHILDREN">
  <Description>
    <title lang="en">Harry Potter</title>
    <author>J K. Rowling</author>
    <year>2005</year>
    <stock>NO</stock>
  </Description>
  <Location>
    <restock>GIP</restock>
    <shelf>20</shelf>
  </Location>
</book>
    <book category="CHILDREN">
  <Description>
    <title lang="en">Harry Potter</title>
    <author>J K. Rowling</author>
    <year>2015</year>
    <stock>YES</stock>
  </Description>
  <Location>
    <restock>GIP</restock>
    <shelf>21</shelf>
  </Location>
</book>  
<book category="WEB">
  <Description>
    <title lang="en">XQuery Kick Start</title>
    <author>James McGovern</author>
    <year>2003</year>
    <stock>YES</stock>
  </Description>
  <Location>
    <restock>NGT</restock>
    <shelf>11</shelf>
  </Location>
</book>

在我的个人问题中，我想首先检查一本书是否有库存，如果有，请检查它所在的书架.如果非常直接，可以访问股票的价值:

In my personal issue, is that I want to first, check if a book is in stock, and if it is, check the shelf where it is located. Access to the value of stock if pretty straight forward:

xmlstarlet sel -t -c "/bookstore/book/Description[stock='YES']" book.xml

但我无法执行条件操作.在 xmlstarlet 指南中，它说我应该使用 -i 或 --if，但我一直在尝试这样做:

But I am unable to do the conditional. In the xmlstarlet guide, it says the I should use -i or --if, but I've been trying to do it as follows:

xmlstarlet sel -t -c -i "/bookstore/book/Description[stock='YES']" -v "/bookstore/book/Location/shelf" book.xml

因为我看到了类似的问题，但它现在可以工作了.有什么想法吗?

Because I saw a similar problem, but it is now working. Any ideas?

使用以下方法，我不会出错，但不会出错

Using the following approach, I don't get errors, but anything at all

cat book.xml | xmlstarlet sel -t -m "/bookstore/book/Description" -i "@stock='YES'" -v '/bookstore/book/Location/shelf'

编辑 2:

我一直在想，如果我有两本同名的书会发生什么.我已经编辑了上面的代码，现在我有两本书叫哈利波特，每一本书都有不同的出版日期和书架

I've been thinking about what would happen if I have two books called the same. I've edited the code above, and now I have 2 book called Harry Potter, each one with different publishing dates and shelves

按照 Daniel Haley 的方法，我想知道所有标题为 Harry Potter 的书:

Following Daniel Haley approach, I want to know all the book with the title harry potter:

 xmlstarlet sel -t -v "/*/book[Description/title='Harry Potter']/Location/shelf"

但我只得到第一个结果，但我想要所有结果.

But I only get the first result, but I want all of them.

推荐答案

除了不需要条件语句 (-i) 之外，也没有必要匹配 (-m代码>)要么；只需获取值 (-v)...

In addition to not needing conditionals (-i), it's also not really necessary to match (-m) either; just get the value (-v)...

xmlstarlet sel -t -v "/*/book[Description/stock='YES']/Location/shelf" -n book.xml

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