使用 XSLgenerate-key() 的唯一元素
首先感谢在我之前的帖子中回复的所有人。为了避免混淆，我在这里发布类似的信息，但问题也相应更新。
我的问题是下面所示的 xsl for-each 从未被执行，表明结果集中没有任何内容。但是，我不明白为什么。下面进一步描述。
输入结构
<AllMyResults>
<Result>
<someElement>value</state>
<otherElement>value 2</state>
<subject>Get unique subjects!</state>
</Result>
</AllMyResults>
在我的 XSL 文件顶部，我有关键语句
<xsl:key name="SubjectKey" match="All_Results/Result" use="subject"/>
[2] 我的 XSL 文件的核心内容，它使用不同的输入结构：
<xsl:for-each select="$ResultSet/subject[
generate-id()
= generate-id(key('SubjectKey', 'subject')[1])
]">
... this point is never reached ...
</xsl:for-each>
输入结构由上面的[2]使用 输入结构只是一个元素列表。
我在这里缺少什么？我使用调试器确定 for-each 从未执行过，这表明表达式 $ResultSet/subject[generate-id() =generate-id(key('SubjectKey', 'subject) 生成的集合')[1])] 是空集。但为什么？
其他信息
$ResultSet 是一个节点集。它是传递给模板的参数。根据我的调试器，“key”语句被执行适当的次数——每次“主题”出现在我的输入文件中一次。根据我读到的关于generate-id()的内容，没有参数，它在当前节点上运行。我还尝试了各种变体，而不是 $ResultSet/subject。 （$ResultSet/*/subject、$ResultSet/* 等）
First of all thank you to everyone who replied in my previous thread. In the interest of avoiding confusion I am posting similar information here, but questions updated accordingly.
My problem is that my xsl for-each shown below never gets executed, indicating that there is nothing in the result set. However, I cannot figure out why. Further description below.
Input structure
<AllMyResults>
<Result>
<someElement>value</state>
<otherElement>value 2</state>
<subject>Get unique subjects!</state>
</Result>
</AllMyResults>
At the top of my XSL file I have the key statement
<xsl:key name="SubjectKey" match="All_Results/Result" use="subject"/>
[2] The meat of my XSL file, which uses a different input structure:
<xsl:for-each select="$ResultSet/subject[
generate-id()
= generate-id(key('SubjectKey', 'subject')[1])
]">
... this point is never reached ...
</xsl:for-each>
Input structure used by [2] above
The input structure is just a list of elements.
What am I missing here? I used a debugger to determine that the for-each was never executed, which indicates that the set generated by the expression $ResultSet/subject[generate-id() = generate-id(key('SubjectKey', 'subject')[1])] was the empty set. But why?
Additional Info
$ResultSet is a node set. It was a parameter passed in to the template. According to my debugger, the "key" statement gets executed the appropriate amount of times -- once per time a "subject" shows up in my input file. According to what I've read about generate-id(), with no params, it operates on the current node. Instead of $ResultSet/subject I've also tried all sorts of variations. ($ResultSet/*/subject, $ResultSet/*, etc)
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（2）
我相信应该是
key('SubjectKey', subject)，而不是key('SubjectKey', 'subject')（注意引号）并且谓词应该是在$ResultSet上，而不是在$ResultSet/subject上：I believe that should be
key('SubjectKey', subject), notkey('SubjectKey', 'subject')(note the quotes) and that the predicate should be on$ResultSet, not$ResultSet/subject:您是否尝试过，因为密钥只需要知道它在哪个节点上匹配，而不是 xpath，这似乎就是您正在做的事情。
Have you tried as the key only needs to know what node it is matching on not the xpath, which seems to be what you are doing.