XSLT 为相同 XSL 的相同输入 XML 获取两个不同的输出 [英] XSLT Getting two different output for same input XML for same XSL

问题描述

我一直在在线工具 [XSLT 1.0 处理器] 中尝试我的 XSLT 代码:

I have been trying my XSLT code in the online tool [XSLT 1.0 processor]:

http://www.freeformatter.com/xsl-transformer.html

最近，我不得不使用xs:dateTime，因此开始使用使用XSLT 2.0 处理器的工具，http://xsltransform.net/

Recently, I had to make use of xs:dateTime and hence started using the tool that uses XSLT 2.0 processor, http://xsltransform.net/

现在，当我试图解决一个问题时，我发现我在这两个处理器中为相同的输入 XML 获得了不同的输出.此处发布的代码不是我正在处理的真实代码；这是为了模拟我面临的奇怪输出.

Now, when i was trying to solve a problem, i see that i get different output for the same input XML in these two processors. The code posted here is not the real code i am working on; this is to simulate the weird output i faced.

XML:

<?xml version="1.0" encoding="UTF-8"?>
<items>
    <book> 
        <title></title>
    </book>
    <phone>apple</phone>
</items>

XSLT:

<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet version="1.0"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

    <xsl:output method="xml" version="1.0" encoding="UTF-8"
        indent="yes" />

    <xsl:template match="/">
        <items><xsl:apply-templates select="items/*" /></items>
    </xsl:template>

    <!-- ignore empty elements -->
    <xsl:template match="*[not(normalize-space())]" />


    <xsl:template match="book">
      <newbook><xsl:apply-templates /></newbook>
    </xsl:template>

    <xsl:template match="title">
      <newtitle><xsl:apply-templates /></newtitle>
    </xsl:template>

    <xsl:template match="phone">
      <newphone><xsl:apply-templates /></newphone>
    </xsl:template>

</xsl:stylesheet>

来自 http://xsltransform.net/ 的输出: [输出 1]

Output from http://xsltransform.net/ : [output 1]

<?xml version="1.0" encoding="UTF-8"?>
<items>
   <newbook> 
        <newtitle/>
    </newbook>
   <newphone>apple</newphone>
</items>

来自 http://www.freeformatter.com/xsl-transformer.html 的输出: [输出 2]

Output from http://www.freeformatter.com/xsl-transformer.html : [output 2]

<?xml version="1.0" encoding="UTF-8"?>
<items>
   <newphone>apple</newphone>
</items>

预期输出 XML 是 output 2 .

Expected output XML is output 2 .

知道为什么会有这种不同的输出行为吗?

Any idea why this different output behavior?

注意:我查看了另一个 SO 问题:为同一个 XSL 文件生成两个不同的输出?，但那是不同的.

note: I looked at another SO question: Generating two different outputs for the same XSL file?, but that is different.

编辑

为了更清楚地说明哪个工具产生了哪个输出:

To add more clarity on which tool produced which output:

http://xsltransform.net/ 产生 output 1

http://www.freeformatter.com/xsl-transformer.html 产生 output 2

更新[02/10/2014] - 关于解决方案

由于 Jim Garrison 首先提供了正确答案，因此将其标记为答案.然而，还有其他重要的点，正如其他人所指出的，所以我在这里总结一下.

Since the correct answer was first provided by Jim Garrison, that's marked as answer. However, there are other important points as well, as pointed out by others, Hence I am wrapping up all here.

<xsl:template match="*[not(normalize-space())]" />

上述模板消除了 XSLT1 和 XSLT2 中的空节点.因此输出 2 是正确的

The above template eliminates the empty nodes in both XSLT1 and XSLT2. Hence output 2 is correct

*从工具中获取输出 1 的原因 - http://xsltransform.net/ :*

*Reason for getting output 1 from the tool - http://xsltransform.net/ :*

1. 正如@michael.hor257k 指出的，有两个模板与 元素匹配.
2. 该工具使用的是 Saxon-HE 9.5.1.3，输出 1 行为可能是最新维护版本中修复的错误 [@Michael Kay 在他的回答中解释得很好]立>
3. 正如@Ian Roberts 在他的回答中提到的，有一个分配给不同类型模板的默认优先级概念.将模板语法更改为:<xsl:template match="*[not(normalize-space())]" priority="2"/>无论 Saxon 版本如何，这两种工具都会产生相同的输出，因为我们明确定义了模板的优先级.

1. As @michael.hor257k pointed out, there are two templates that matches the <book> element.
2. The tool was using Saxon-HE 9.5.1.3, and the output 1 behavior was probably a bug that was fixed in the latest maintenance release [@Michael Kay explained well in his answer]
3. As @Ian Roberts mentioned in his answer, there is a concept of default priorities that are assigned to different types of templates. Changing the template syntax to: <xsl:template match="*[not(normalize-space())]" priority="2"/> yields the same output in both the tools regardless of Saxon version, because we are explicitly defining the priority to the template.

推荐答案

输出 2 是正确的.我在 Oxygen/XML 中运行了您的示例，同时使用了 XSLT1 和 XSLT2，并得到了正确的结果.您的模板

Output 2 is correct. I ran your example in Oxygen/XML, using both XSLT1 and XSLT2 and got the correct results for both. Your template

<xsl:template match="*[not(normalize-space())]" />

消除 XSLT1 和 XSLT2 中的空节点.

eliminates the empty nodes in both XSLT1 and XSLT2.

因此，唯一可能的结论是生成输出 1 的在线工具存在错误.

Therefore the only possible conclusion is that the online tool that produced your Output 1 has a bug.

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