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Asked: 2026-06-14T11:31:12+00:00

Suppose I have a source example document like this: <html> <b><i><u>TestBIU</u></i></b> <i><b><u>TestIBU</u></b></i> <i><u><b>TestIUB</b></u></i> <b><u><i>TestBUI</i></u></b>

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Suppose I have a source example document like this:

<html>
  <b><i><u>TestBIU</u></i></b>
  <i><b><u>TestIBU</u></b></i>
  <i><u><b>TestIUB</b></u></i>
  <b><u><i>TestBUI</i></u></b>
  <u><i><b>TestUIB</b></i></u>
  <u><b><i>TestUBI</i></b></u>
  <u>TestU</u>
  <i>TestI</i>
  <b>TestB</b>
  <u><b>TestUB</b></u>
</html>

I need a XSLT-Template that produces this:

<html>
  <b><i>TestBIU</i></b>
  <i><b>TestIBU</b></i>
  <i><b>TestIUB</b></i>
  <b><i>TestBUI</i></b>
  <i><b>TestUIB</b></i>
  <b><i>TestUBI</i></b>
  <u>TestU</u>
  <i>TestI</i>
  <b>TestB</b>
  <b>TestUB</b>
</html>

So, it should remove the underline tag when it occurs in combination with italic and/or bold tags. When only underlined, it should remain.
Any ideas how to solve this particular problem?

Here is my attempt, but if fails for TestUIB and TestUBI:

<xsl:template match="/">
    <html>
    <xsl:apply-templates />
    </html>
</xsl:template>
<xsl:template match="b/u">
      <xsl:apply-templates />
</xsl:template>
<xsl:template match="i/u">    
      <xsl:apply-templates />
</xsl:template>
<xsl:template match="u/i">
  <i><xsl:apply-templates /></i>
</xsl:template> 
<xsl:template match="u/b">
    <b><xsl:apply-templates /></b>
</xsl:template>    
<xsl:template match="b | u | i">
    <xsl:copy>
        <xsl:apply-templates select="* | text()"/>
    </xsl:copy>
</xsl:template>
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1 Answer

  1. Editorial Team

    Try this:

    <xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema">

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

<xsl:template match="u[ancestor::b | ancestor::i | descendant::b | descendant::i]">
    <xsl:apply-templates />
</xsl:template>

</xsl:stylesheet>

    It produces the following output to your sample:

    <html>
    <b><i>TestBIU</i></b>
    <i><b>TestIBU</b></i>
    <i><b>TestIUB</b></i>
    <b><i>TestBUI</i></b>
    <i><b>TestUIB</b></i>
    <b><i>TestUBI</i></b>
    <u>TestU</u>
    <i>TestI</i>
    <b>TestB</b>
    <b>TestUB</b>
</html>

    Description: In my solution I’m using identity transform that copies everything node by node and attribute by attribute. The second template intercepts all <u> HTML tags that have <i> or <b> amongst their ancestors or descendants. When such situation occurs, we do not copy the tag, but only invoke apply-templates which will take care of its children.

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