用于计算特定子树中叶节点的简洁表达式 [英] Concise expression for counting leaf nodes in specific subtrees
问题描述
在我尝试回答问题XSLT - 棘手的转换时,我遇到了以下任务:><块引用>
对于每个标签
计算第二个叶子节点的数量
子标签.
将叶节点"定义为一个
标签,该标签没有其他
标签作为子标签.不过,它可能有其他标签作为孩子.
我最终得到了两个表达式:
<xsl:variable name="grandchildren_and_below" select="count(MMM[2]//MMM[count(MMM) = 0])"/>
第一个计算第二个孩子的叶子,第二个计算第二个孩子的所有祖先.我无法将这两个组合成一个表达式(除了我必须做的明显求和 :-) ).不知何故,我无法使节点数组索引选择器 [2]
、附加条件 count(MMM) = 0
和祖先路径 `//' 适合相同的表达式.
那么,有没有更简洁(可能更优雅)的方式来编写这个表达式?
非常感谢!
为了测试,你可以使用这个输入文件:
<MMM><MMM><MMM><MMM/><MMM/></MMM><MMM><MMM/><MMM><MMM/></MMM></MMM></MMM><MMM><MMM/></MMM></MMM>
以及以下 XSLT 表:
<xsl:样式表版本=1.0"xmlns:xsl="http://www.w3.org/1999/XSL/Transform"><xsl:output method="xml" encoding="ISO-8859-1" indent="yes"/><xsl:template match="MMM"><xsl:variable name="just_children" select="count(MMM[position() = 2 and count(MMM) = 0])"/><xsl:variable name="grandchildren_and_below" select="count(MMM[2]//MMM[count(MMM) = 0])"/><MMM just_children="{$just_children}" grandchildren_and_below="{$grandchildren_and_below}"><xsl:apply-templates/></MMM></xsl:模板></xsl:stylesheet>
你的 just_children 变量可以这样写:
您的 grandchildren_and_below 变量可以写成这样:
要将它们合二为一,您可以使用后代或自我轴,就像这样
In my attempt to answer question XSLT - Tricky Transformation I came across the following task:
For each tag
<MMM>
count the number of leaf nodes in the second<MMM>
child tag.
Define "leaf node" as an <MMM>
tag that does not have other <MMM>
tags as children. It may have other tags as children, though.
I ended up with two expressions:
<xsl:variable name="just_children" select="count(MMM[position() = 2 and count(MMM) = 0])"/>
<xsl:variable name="grandchildren_and_below" select="count(MMM[2]//MMM[count(MMM) = 0])"/>
The first one counts the leafs in the second child, the second one in all ancestors of the second child. I was not able to combine these two into one expression (except for the obvious summing which I have to do :-) ). Somehow I cannot make the node array index selector [2]
, the additional condition count(MMM) = 0
, and the ancestor path `//' fit into the same expression.
So, is there more a concise (and probably more elegant) way to write this expression?
Thanks a lot!
For testing you can use this input file:
<?xml version="1.0" encoding="ISO-8859-1"?>
<MMM>
<MMM>
<MMM>
<MMM/>
<MMM/>
</MMM>
<MMM>
<MMM/>
<MMM>
<MMM/>
</MMM>
</MMM>
</MMM>
<MMM>
<MMM/>
</MMM>
</MMM>
and the following XSLT sheet:
<?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" encoding="ISO-8859-1" indent="yes"/>
<xsl:template match="MMM">
<xsl:variable name="just_children" select="count(MMM[position() = 2 and count(MMM) = 0])"/>
<xsl:variable name="grandchildren_and_below" select="count(MMM[2]//MMM[count(MMM) = 0])"/>
<MMM just_children="{$just_children}" grandchildren_and_below="{$grandchildren_and_below}">
<xsl:apply-templates/>
</MMM>
</xsl:template>
</xsl:stylesheet>
Your just_children variable could be written as this:
<xsl:variable name="just_children" select="count(MMM[2][not(MMM)])"/>
And your grandchildren_and_below variable could be written as this:
<xsl:variable name="grandchildren_and_below" select="count(MMM[2]//MMM[not(MMM)])"/>
To put them both together as one, you could use the descendant-or-self axes, like so
<xsl:variable name="all" select="count(MMM[2]//descendant-or-self::MMM[not(MMM)])"/>
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