对子树进行排序并将其存储在 xsl:variable 中
我正在使用 XSL 样式表,并且尝试使用显示的方法 此处将排序的子树存储为变量。我使用 saxon 8.7 和 xml-maven-plugin 来转换我的 XML 文件。这是我的代码:
<xsl:variable name="miniDays">
<xsl:for-each select="//day[position() > $firstPosToShow]">
<xsl:sort select="@date" order="descending" />
<xsl:copy-of select=".|@*" />
</xsl:for-each>
</xsl:variable>
当我运行样式表时,出现以下错误:
Error at xsl:copy-of on line 598 of file:/D:/home/Projects/src/main/xsl/site.xsl:
XTDE0420: Cannot create an attribute node (date) whose parent is a document node
如果我只是将子树设置为变量而不进行排序,它可以工作,但未排序:
<xsl:variable name="miniDays" select="//day[position() > $firstPosToShow]" />
如果我将 copy-of 语句的 select 设置为“ .”,它超过了这一点,但是当我实际尝试使用变量数据时,它给了我一个错误。这是它的使用方式:
<xsl:for-each select="exsl:node-set($miniDays)">
<xsl:variable name="in" select="local:calculate-total-in-days(.)" />
<!-- do some stuff with the var -->
</xsl:for-each>
错误:
Error on line 676 of file:/D:/home/Projects/src/main/xsl/site.xsl:
XPTY0004: Required item type of first argument of local:calculate-total-in-days() is element(); supplied value has item type document-node()
函数:
<xsl:function name="local:calculate-total-in-days">
<xsl:param name="days" as="element()*" />
<!-- Do some calculations -->
</xsl:function>
我是否错误地使用了 exsl:node-set?副本的选择中应该包含什么“。”或“.|@*”?
I'm working with an XSL stylesheet, and I'm trying to use the method shown here to store a sorted subtree as a variable. I'm using saxon 8.7 vis the xml-maven-plugin to transform my XML file. Here's the code that I have:
<xsl:variable name="miniDays">
<xsl:for-each select="//day[position() > $firstPosToShow]">
<xsl:sort select="@date" order="descending" />
<xsl:copy-of select=".|@*" />
</xsl:for-each>
</xsl:variable>
When I run the stylesheet, I get the following error:
Error at xsl:copy-of on line 598 of file:/D:/home/Projects/src/main/xsl/site.xsl:
XTDE0420: Cannot create an attribute node (date) whose parent is a document node
If I just set the subtree to the variable without sorting, it works, but it's not sorted:
<xsl:variable name="miniDays" select="//day[position() > $firstPosToShow]" />
If I set the copy-of statement's select to ".", it gets past that point, but gives me an error later on when I actually try to use the variable data. Here's how it's being used:
<xsl:for-each select="exsl:node-set($miniDays)">
<xsl:variable name="in" select="local:calculate-total-in-days(.)" />
<!-- do some stuff with the var -->
</xsl:for-each>
And the error:
Error on line 676 of file:/D:/home/Projects/src/main/xsl/site.xsl:
XPTY0004: Required item type of first argument of local:calculate-total-in-days() is element(); supplied value has item type document-node()
The function:
<xsl:function name="local:calculate-total-in-days">
<xsl:param name="days" as="element()*" />
<!-- Do some calculations -->
</xsl:function>
Am I using exsl:node-set incorrectly? And what should be in the copy-of's select, "." or ".|@*"?
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您的代码存在一些问题:
day
子元素集中位于$firstPosToShow+1
或更大位置的每个day
元素。它的父级!您很可能想要(//day)[position() >= $firstPosToShow]
。这会复制当前元素,同时也会复制其属性。仅当父元素是元素时才可以复制属性。情况并非如此,因为无类型变量内部的操作会创建临时树(文档),并且文档节点不能具有属性。正确的指令是:列表项中的代码如下:
表达式
exsl:node-set($miniDays)
再次为document-node()
类型,并且
> 仅选择一个(此)节点。这解释了引发的错误,因为local:calculate-total-in-days(.)
需要一个元素参数,但传递了一个文档节点。正确的代码是:
另外,XSLT 2.0 中不需要
exslt:node:set()
,因为 XSLT 2.0 中没有 RTF 类型,事实上也不是Saxon 9.x 支持。 因此,正确的代码为:或者,您可以考虑将
$miniDays
的类型显式指定为element()*< /code> 这将简化代码 - 不需要使用
$miniDays/*
- 只需使用$miniDays
There are a number of problems with your code:
<xsl:for-each select="//day[position() > $firstPosToShow]">
. This will select everyday
element in the document that is at position$firstPosToShow+1
or bigger in the set ofday
children of its parent! Most probably you want(//day)[position() >= $firstPosToShow]
<xsl:copy-of select=".|@*" />
. This copies the current element, but also copies its attributes. An attribute can be copied only when the parent is an element. This is not the case as the operations inside an untyped variable create a temporary tree (a document) and a document node cannot have attributes. The correct instruction is:<xsl:copy-of select="." />
List itemIn the following code:
the expression
exsl:node-set($miniDays)
again is of typedocument-node()
and the<xsl:for-each>
selects just one (this) node. This explains the raised error, becauselocal:calculate-total-in-days(.)
expects an element-argument but is passed a document node.The correct code is:
Also,
exslt:node:set()
is not required in XSLT 2.0, because there is no RTF type in XSLT 2.0, and in fact is not supported in Saxon 9.x. Therefore, the correct code will be:Alternatively, you may consider specifying the type of
$miniDays
explicitly aselement()*
and this will simplify the code -- it would not be necessary to use$miniDays/*
-- just$miniDays