XSLT - 与标识模式一起更改节点上下文的问题

Question

我有一个给定的源XML文档，其结构如下：

<?xml version="1.0" encoding="UTF-8"?>
<sample>
  <definition>
    <variable>
      <name>object01_ID_138368350261919620</name>
      <value>NUL</value>
    </variable>  
    <variable>
      <name>param01_ID_138368350261919621</name>
      <value>10</value>
    </variable>
    <variable>
      <name>param02_ID_138368350261919622</name>
      <value>100</value>
    </variable>
  </definition>
  <override>
    <assignment>
      <name>object01_ID_138368350261919620</name>
      <path>module01/object01</path>
    </assignment>
    <assignment>
      <name>param01_ID_138368350261919621</name>
      <path>module01/object01/param01</path>
    </assignment>
    <assignment>
      <name>param02_ID_138368350261919622</name>
      <path>module01/object01/param02</path>
    </assignment>
  </override>
</sample>

源XML的特征是：
<assignment>元素中的每个<override>元素仅对应<variable>元素中的一个<definition>元素。这种1：1关系由其<name>元素的内容确定。

转换和目标XML的要求是：
根据{{​​1}}元素内容的模式，在<path>元素的<assignment>元素中，我想添加一个新的<override>元素。需要注意的是，<assignment>元素是主要信息。因此，首先必须创建一个包含<assignment>和<assignment>内容的新<path>元素，并与相同的<name>元素相同<variable>元素1}}内容和特定的<name>内容必须在<value>元素的最后位置创建并插入。例如，要添加 param03 ，正确的结果应如下所示：

<definition>

用于转换的我的XSL 2.0样式表：
对于身份转换，我选择使用 [Dimitre Novatchev]推荐的细粒度控制身份规则。应用处理param03模板，我创建了一个新的<?xml version="1.0" encoding="UTF-8"?> <sample> <definition> <variable> <name>param00_ID_138368350261919620</name> <value>NUL</value> </variable> <variable> <name>param01_ID_138368350261919621</name> <value>10</value> </variable> <variable> <name>param02_ID_138368350261919622</name> <value>100</value> </variable> <variable> <name>Param03_ID_138368350261919623</name> <value>1000</value> </variable> </definition> <override> <assignment> <name>param00_ID_138368350261919620</name> <path>module01/object01</path> </assignment> <assignment> <name>param01_ID_138368350261919621</name> <path>module01/object01/param01</path> </assignment> <assignment> <name>param02_ID_138368350261919622</name> <path>module01/object01/param02</path> </assignment> <assignment> <name>Param03_ID_138368350261919623</name> <xpath>module01/object01/param03</xpath> </assignment> </override> </sample> 元素及其特定的<assignment>和<path>内容。在该模板中，我喜欢使用<name>将节点上下文更改为for-each元素，并在最后位置添加一个新的<definition>元素以及相应的<variable>内容，特定的<name>内容。此样式表已经过Saxon HE 9.5测试。

<value>

产生错误的XML是：

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" 
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
  xmlns:fo="http://www.w3.org/1999/XSL/Format" 
  xmlns:xs="http://www.w3.org/2001/XMLSchema" 
  xmlns:fn="http://www.w3.org/2005/xpath-functions" 
  exclude-result-prefixes="fo xs fn">
  <!--
  global declarations ==========================================================
  -->
  <xsl:output indent="yes"/>
  <xsl:strip-space elements="*"/>
  <!-- randomid here is just a fake for sake of simplification -->
  <xsl:variable name="randomid" select="138368350261919623"/>
  <!--
  template - identity ==========================================================
  -->
  <xsl:template match="node()|@*" name="identity">
    <xsl:copy>
      <xsl:apply-templates select="@*|node()[1]"/>
    </xsl:copy>
    <xsl:apply-templates select="following-sibling::node()[1]"/>
  </xsl:template>
  <!--
  template - variable assignment ===============================================
  -->
  <xsl:template name="variable_assignment">
    <xsl:param name="value_node_name"/>
    <xsl:param name="value_node_path"/>
    <xsl:message select="'processing: variable assignment'"/>
    <xsl:message select="concat('applying name: ', $value_node_name)"/>
    <xsl:message select="concat('applying path: ', $value_node_path)"/>
    <xsl:call-template name="identity"/>
    <assignment>
      <name>
        <xsl:value-of select="$value_node_name"/>
      </name>
      <xpath>
        <xsl:value-of select="$value_node_path"/>
      </xpath>
    </assignment>
  </xsl:template>
  <!--
    template - processing param03 =============================================
  -->
  <xsl:template match="/sample/override[not(assignment
              /path[matches(text(), '.*/object01/param03$')])]
              /assignment[path[matches(text(), '.*/object01$')]]">
    <!-- setting params -->
    <xsl:param name="value_node_name_target">
      <xsl:value-of select="concat('Param03_ID', '_', $randomid)"/>
    </xsl:param>
    <xsl:param name="value_node_path_target">
      <xsl:value-of select="concat(./path, '/param03')"/>
    </xsl:param>
    <xsl:param name="value_node_value_target" select="'1000'"/>
    <!-- processing variable assignment -->
    <xsl:call-template name="variable_assignment">
      <xsl:with-param name="value_node_name" select="$value_node_name_target"/>
      <xsl:with-param name="value_node_path" select="$value_node_path_target"/>
    </xsl:call-template>
    <!-- processing variable definition -->
    <xsl:for-each select="/sample/definition/*[position()=last()]">
        <xsl:message select="'processing: variable definition'"/>
      <xsl:message select="concat('Here we are: ', .)"/>
      <xsl:message select="concat('applying name: ', $value_node_name_target)"/>
      <xsl:message select="concat('applying value: ', $value_node_value_target)"/>
      <xsl:call-template name="identity"/>
      <variable>
        <name>
          <xsl:value-of select="$value_node_name_target"/>
        </name>
        <value>
          <xsl:value-of select="$value_node_value_target"/>
        </value>
      </variable>
    </xsl:for-each>
  </xsl:template>
</xsl:stylesheet>

我遇到的问题是：

1. 节点上下文不会更改。新的<?xml version="1.0" encoding="UTF-8"?> <sample> <definition> <variable> <name>object01_ID_138368350261919620</name> <value>NUL</value> </variable> <variable> <name>param01_ID_138368350261919621</name> <value>10</value> </variable> <variable> <name>param02_ID_138368350261919622</name> <value>100</value> </variable> </definition> <override> <assignment> <name>object01_ID_138368350261919620</name> <path>module01/object01</path> </assignment> <assignment> <name>param01_ID_138368350261919621</name> <path>module01/object01/param01</path> </assignment> <assignment> <name>param02_ID_138368350261919622</name> <path>module01/object01/param02</path> </assignment> <assignment> <name>Param03_ID_138368350261919623</name> <xpath>module01/object01/param03</xpath> </assignment> <variable> <name>param02_ID_138368350261919622</name> <value>100</value> </variable> <variable> <name>Param03_ID_138368350261919623</name> <value>1000</value> </variable> </override> </sample> 元素会在最后一个位置添加到<variable>元素中，而不是添加到<override>元素中。
2. 此外，<definition>元素中的最后一个<variable>元素将被复制到<definition>元素中。那不是我想要的。

需要帮助！
如果有人可以建议我，我真的很感激，我必须调整我的XSLT以摆脱上面描述的问题和正确的行为。

非常感谢。

由您提出的XSLT 2.0，由我改编：

<override>

生成的XML（仍然错误）：

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:fo="http://www.w3.org/1999/XSL/Format" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:fn="http://www.w3.org/2005/xpath-functions" exclude-result-prefixes="fo xs fn">
  <!--
  global declarations ==========================================================
  -->
  <xsl:output indent="yes"/>
  <xsl:strip-space elements="*"/>
  <!-- baserandom here is just a fake for sake of simplification -->
  <xsl:param name="baserandom" select="138368350261919623"/>
  <!--MOVED PARAMS FROM ORIGINAL TEMPLATE HERE SO THEY CAN BE USED BY MULTIPLE TEMPLATES -->
  <!--xsl:param name="value_node_path"-->
  <!--I LEFT THE PREDICATE BECAUSE IT APPEARS THAT THERE COULD BE MORE THAN ONE override ELEMENT.-->
  <!--xsl:value-of select="concat(/sample/override[not(assignment/path[matches(text(), '.*/object01/param03$')])]
            /assignment[1]/path, '/param03')"/>
  </xsl:param>
  <xsl:param name="value_node_value" select="'1000'"/-->
  <!--
  template - identity ==========================================================
  -->
  <xsl:template match="node()|@*" name="identity">
    <xsl:copy>
      <xsl:apply-templates select="@*|node()[1]"/>
    </xsl:copy>
    <xsl:apply-templates select="following-sibling::node()[1]"/>
  </xsl:template>
  <!--
  template - definition ========================================================
  -->
  <!--REPLACES THE xsl:for-each THAT PROCESSES THE VARIABLE DEFINITION-->
  <xsl:template match="definition/*[last()]">
    <xsl:param name="value_node_name"/>
    <xsl:param name="value_node_value"/>
    <xsl:call-template name="identity"/>
    <xsl:if test="$value_node_name">
      <xsl:message select="'processing: variable definition'"/>
      <xsl:message select="concat('Here we are: ', .)"/>
      <xsl:message select="concat('applying name: ', $value_node_name)"/>
      <xsl:message select="concat('applying value: ', $value_node_value)"/>
      <variable>
        <name>
          <xsl:value-of select="$value_node_name"/>
        </name>
        <value>
          <xsl:value-of select="$value_node_value"/>
        </value>
      </variable>
    </xsl:if>
  </xsl:template>
  <!--
    template - processing param03 =============================================
  -->
  <xsl:template match="/sample/override[not(assignment/path[matches(text(), '.*/object01/param03$')])]
        /assignment[path[matches(text(), '.*/object01$')]]">
    <!-- name -->
    <xsl:param name="value_node_name">
      <xsl:value-of select="concat('param03_ID', '_', $baserandom)"/>
    </xsl:param>
    <!-- path -->
    <xsl:param name="value_node_path">
      <xsl:value-of select="concat(./path, '/param03')"/>
    </xsl:param>
    <!-- value -->
    <xsl:param name="value_node_value" select="'1000'"/>
    <!-- processing definition -->
    <xsl:apply-templates select="/sample/definition/*[last()]">
      <xsl:with-param name="value_node_name" select="$value_node_name"/>
      <xsl:with-param name="value_node_value" select="$value_node_value"/>
    </xsl:apply-templates>
    <!-- processing assignment -->
    <xsl:message select="'processing: variable assignment'"/>
    <xsl:message select="concat('applying name: ', $value_node_name)"/>
    <xsl:message select="concat('applying path: ', $value_node_path)"/>
    <xsl:call-template name="identity"/>
    <assignment>
      <name>
        <xsl:value-of select="$value_node_name"/>
      </name>
      <path>
        <xsl:value-of select="$value_node_path"/>
      </path>
    </assignment>
  </xsl:template>
</xsl:stylesheet>

Answer 1

您遇到的问题是xsl:for-each未更改输出上下文。它只是改变迭代上下文。

当您在assignment上进行迭代时，您仍在xsl:for-each select="/sample/definition/*[position()=last()]（模板匹配）的上下文中输出。

您需要从variable的上下文输出新的definition。

我已经修改了你的XSLT以产生你想要的东西。它可能不是最终的解决方案，但应该让你更接近。我添加了评论（全部大写）以试图解释我改变了什么。如果有问题，请告诉我。

修改后的XSLT 2.0

<xsl:stylesheet version="2.0" 
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
    xmlns:fo="http://www.w3.org/1999/XSL/Format" 
    xmlns:xs="http://www.w3.org/2001/XMLSchema" 
    xmlns:fn="http://www.w3.org/2005/xpath-functions" 
    exclude-result-prefixes="fo xs fn">

    <!--
  global declarations ==========================================================
  -->
    <xsl:output indent="yes"/>
    <xsl:strip-space elements="*"/>

    <!-- randomid here is just a fake for sake of simplification -->
    <xsl:param name="randomid" select="138368350261919623"/>
    <!--MOVED PARAMS FROM ORIGINAL TEMPLATE HERE SO THEY CAN BE USED BY MULTIPLE TEMPLATES -->
    <xsl:param name="value_node_name_target">
        <xsl:value-of select="concat('Param03_ID', '_', $randomid)"/>
    </xsl:param>
    <xsl:param name="value_node_path_target">
        <!--I LEFT THE PREDICATE BECAUSE IT APPEARS THAT THERE COULD BE MORE THAN ONE override ELEMENT.-->
        <xsl:value-of select="concat(/sample/override[not(assignment/path[matches(text(), '.*/object01/param03$')])]
            /assignment[1]/path, '/param03')"/>
    </xsl:param>
    <xsl:param name="value_node_value_target" select="'1000'"/>

    <!--
  template - identity ==========================================================
  -->
    <xsl:template match="node()|@*" name="identity">
        <xsl:copy>
            <xsl:apply-templates select="@*|node()[1]"/>
        </xsl:copy>
        <xsl:apply-templates select="following-sibling::node()[1]"/>
    </xsl:template>

    <!--
  template - variable assignment ===============================================
  -->
    <!--MOVED CODE FROM THIS TEMPLATE INTO THE assignment TEMPLATE-->

    <!--REPLACES THE xsl:for-each THAT PROCESSES THE VARIABLE DEFINITION-->
    <xsl:template match="definition[../override[not(assignment/path[matches(text(), '.*/object01/param03$')])]
        /assignment[path[matches(text(), '.*/object01$')]]]/*[last()]">
        <xsl:message select="'processing: variable definition'"/>
        <xsl:message select="concat('Here we are: ', .)"/>
        <xsl:message select="concat('applying name: ', $value_node_name_target)"/>
        <xsl:message select="concat('applying value: ', $value_node_value_target)"/>
        <xsl:call-template name="identity"/>
        <variable>
            <name>
                <xsl:value-of select="$value_node_name_target"/>
            </name>
            <value>
                <xsl:value-of select="$value_node_value_target"/>
            </value>
        </variable>
    </xsl:template>

    <!--
    template - processing param03 =============================================
  -->
    <xsl:template match="/sample/override[not(assignment/path[matches(text(), '.*/object01/param03$')])]
        /assignment[path[matches(text(), '.*/object01$')]]">
        <!-- setting params -->
        <!--MOVED TEMPLATE PARAMS TO GLOBAL PARAMS-->
        <!-- processing variable assignment -->
        <!--REPLACED UNNECESSARY xsl:call-template WITH ACTUAL CODE-->
        <xsl:message select="'processing: variable assignment'"/>
        <xsl:message select="concat('applying name: ', $value_node_name_target)"/>
        <xsl:message select="concat('applying path: ', $value_node_path_target)"/>
        <xsl:call-template name="identity"/>
        <assignment>
            <name>
                <xsl:value-of select="$value_node_name_target"/>
            </name>
            <!--CHANGED FROM xpath TO path (APPEARED TO BE A TYPO)-->
            <path>
                <xsl:value-of select="$value_node_path_target"/>
            </path>
        </assignment>       <!-- processing variable definition -->
        <!--THIS IS NOW DONE BY A SEPARATE MATCHING TEMPLATE-->
    </xsl:template>
</xsl:stylesheet>

<强>输出

<sample>
   <definition>
      <variable>
         <name>object01_ID_138368350261919620</name>
         <value>NUL</value>
      </variable>
      <variable>
         <name>param01_ID_138368350261919621</name>
         <value>10</value>
      </variable>
      <variable>
         <name>param02_ID_138368350261919622</name>
         <value>100</value>
      </variable>
      <variable>
         <name>Param03_ID_138368350261919623</name>
         <value>1000</value>
      </variable>
   </definition>
   <override>
      <assignment>
         <name>object01_ID_138368350261919620</name>
         <path>module01/object01</path>
      </assignment>
      <assignment>
         <name>param01_ID_138368350261919621</name>
         <path>module01/object01/param01</path>
      </assignment>
      <assignment>
         <name>param02_ID_138368350261919622</name>
         <path>module01/object01/param02</path>
      </assignment>
      <assignment>
         <name>Param03_ID_138368350261919623</name>
         <path>module01/object01/param03</path>
      </assignment>
   </override>
</sample>