XSLT 转换期间在输出文档中的特定点插入元素 [英] Insert element at specific point in output document during XSLT transformation

问题描述

我想知道您是否可以在处理过程中访问结果文档.

I am wondering if you can access the result-document during processing.

我问的原因是我正在转换输入文档并希望根据某些条件插入元素，但这必须在我遍历树并且我即将创建它时发生.

The reason I ask is that I am transforming an input document and would like to insert elements depending on some conditions but this would have to occur when I have traversed the tree and I am nearly at end of creating it.

转换后的 xml 看起来类似于:

The transformed xml looks something similar to this:

<xform>
    <xforms>
        <model>
            <instance>
                <data />
                <data />
            </instance>
        </model>
        <bind />
        <bind />
        <bind />
    </xforms>
</xform>

我打算在转换期间(在上述 xml 序列化之前)访问 标记并插入额外的 元素.

I intend, during transformation (before the above xml is serialized), to access the <instance> tag and insert additional <data> elements.

注意输入文档与上面的 xml 不同——上面的 xml 是转换应该产生的.

Note The input document is different from the above xml - the above xml is what the transformation should produce.

同样，我想访问 元素并插入额外的 节点.

Similarly, I would want to access the <xform> element and insert additional <bind> nodes.

所以最终文档看起来像这样(假设我添加了 2 个数据节点和 2 个绑定节点):

So the final document would look like this (assuming I added 2 data nodes and 2 bind nodes):

<xform>
    <xforms>
        <model>
            <instance>
                <data />
                <data />
                <data>new data node</data>
                <data>second new data node</data>
            </instance>
        </model>
        <bind />
        <bind />
        <bind />
        <bind>new bind node</bind>
        <bind>second new bind node</bind>
    </xforms>
</xform>

感谢任何帮助.

推荐答案

不，您不能访问结果文档，但是您可以在变量中创建临时树，然后再次处理它们，如果需要使用不同的模板模式.所以而不是例如

No, you can't access a result-document, you can however create temporary trees in variables and then process them again, if needed with templates with a different mode. So instead of e.g.

<xsl:template match="/">
  <xsl:result-document href="example.xml">
<xform>
 <xforms>
  <model>
   <instance>
    <data>
    </data>
   </instance>
  </model>
  <bind />
  <bind />
  <bind />
 </xforms>
</xform>
  </xsl:result-document>
</xsl:template>

你会在一个变量中创建第一个结果，然后进一步处理它，例如

you would create the first result in a variable and then process it further as in e.g.

<xsl:template match="@* | node()">
  <xsl:copy>
    <xsl:apply-templates select="@* | node()"/>
  </xsl:copy>
</xsl:template>

<xsl:template match="/">
  <xsl:variable name="temp1">
<xform>
 <xforms>
  <model>
   <instance>
    <data>
    </data>
   </instance>
  </model>
  <bind />
  <bind />
  <bind />
 </xforms>
</xform>
</xsl:variable>
  <xsl:result-document href="example.xml">
    <xsl:apply-templates select="$temp1/*"/>
  </xsl:result-document>
</xsl:template>

<xsl:template match="instance">
  <xsl:copy>
    <xsl:apply-templates/>
    <data>...</data>
  </xsl:copy>
</xsl:template>

该示例不使用模式，但我经常将它们与变量和不同的处理步骤一起使用，以将每个步骤的模板与其他步骤干净地分开.

That sample does not use modes but I often use them with variables and different processing steps to cleanly seperate the templates for each step from other steps.

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