Xslt-迭代块中的节点 [英] Xslt - iterate nodes in chunks

问题描述

我有一个现有的xslt脚本，该脚本可以创建带有FOP的PDF，问题是当节点数超过特定限制时，在对特定节点类型进行应用模板时，它的内存不足.为了解决内存问题，我需要将源自该模板调用的结果分解为几个<fo:page-sequence>，但是我不希望每个节点都具有页面顺序，更像是每个100个节点.

I have an existing xslt script which creates a PDF with FOP, problem is that its running out of memory when doing apply-template on a specific nodetype when the node count exceeds a certain limit. In order to fix the memory issue I need to break up the result derived from that template call into several <fo:page-sequence>, but I dont want a page-sequence for each node, more like for each 100 node.

我的第一个想法是使用position()并每100个百分号简单地添加一个新的序列标签，但是由于xslt的格式必须正确，所以我不能像这样打开标签.

My first thought was to use position() and simply add new sequence tags every 100th, but as xslt needs to be well formed I cant have open tags like that.

所以，我的问题是，以100个块为单位迭代特定类型的所有节点的最佳选择是什么?

So, my question is what would be the best alternative to iterate all nodes of a specific type in chunks of 100?

XML源的外观示例

 <var ID="V1"><subnodes/></var>  
 ..
 <var ID="V1000"><subnodes/></var>

当前使用

<fo:page-sequence>
  <xsl:apply-templates select="ns:var"/>
</fo:page-sequence>

所需的FOP XML结果将创建多个页面序列，每个页面序列具有(例如)100个已处理的var节点，而不是全部1000个页面序列的结果.

The wanted FOP XML result would be something which created several page-sequences with (for example) 100 of processed var nodes in each instead of having the result of all 1000 in óne page-sequence.

当前结果

<fo:page-sequence>
  <formatted V1>
  ..
  <formatted V1000>
</fo:page-sequence>

想要的结果

<fo:page-sequence>
   <formatted V1>
    ..
   <formatted V100>
</fo:page-sequence>

<fo:page-sequence>
  <formatted V101>
   ..
  <formatted V200>
 </fo:page-sequence>

..

<fo:page-sequence>
  <formatted V901>
   ..
  <formatted V1000>
</fo:page-sequence>   

推荐答案

编辑:很抱歉输入错误. following-sibling轴后的未接节点测试

Edit: Sorry for typo. Miss node test after following-sibling axis

使用此输入:

<root>
    <var ID="V1">
        <subnodes/>
    </var>
    <var ID="V2">
        <subnodes/>
    </var>
    <var ID="V3">
        <subnodes/>
    </var>
    <var ID="V4">
        <subnodes/>
    </var>
    <var ID="V5">
        <subnodes/>
    </var>
    <var ID="V6">
        <subnodes/>
    </var>
    <var ID="V7">
        <subnodes/>
    </var>
    <var ID="V8">
        <subnodes/>
    </var>
</root>

此样式表:

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:fo="http://www.w3.org/1999/XSL/Format">
    <xsl:template match="root">
        <xsl:copy>
            <xsl:copy-of select="document('')/*/namespace::*[name()!='xsl']"/>
            <!-- Forget above. It's just to prettify namespace fixup -->
            <xsl:for-each select="var[position() mod 3 = 1]">
                <fo:page-sequence>
                    <xsl:apply-templates
             select=".|following-sibling::var[3 > position()]"/>
                </fo:page-sequence>
            </xsl:for-each>
        </xsl:copy>
    </xsl:template>
    <xsl:template match="var">
        <formatted id="{@ID}"/>
    </xsl:template>
</xsl:stylesheet>

输出:

<root xmlns:fo="http://www.w3.org/1999/XSL/Format">
    <fo:page-sequence>
        <formatted id="V1" />
        <formatted id="V2" />
        <formatted id="V3" />
    </fo:page-sequence>
    <fo:page-sequence>
        <formatted id="V4" />
        <formatted id="V5" />
        <formatted id="V6" />
    </fo:page-sequence>
    <fo:page-sequence>
        <formatted id="V7" />
        <formatted id="V8" />
    </fo:page-sequence>
</root>

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