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File: Data.xml
<poem>
<author>author 1</author>
<date>1912</date>
<title>Song</title>
<stanza>
<line>line 1</line>
<line>line 2</line>
<line>line 3</line>
<line>line 4</line>
</stanza>
<stanza>
<line>line 5</line>
<line>line 6</line>
<line>line 7</line>
<line>line 8</line>
</stanza>
<stanza>
<line>line 9</line>
<line>line 10</line>
<line>line 11</line>
<line>line 12</line>
</stanza>
</poem>
File: Transform.xslt
<?xml version="1.0"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
<html>
<body>
<p>
<xsl:apply-templates select="/poem/stanza" />
</p>
</body>
</html>
</xsl:template>
<xsl:template match="stanza">
<p>
<table>
<xsl:apply-templates />
</table>
</p>
</xsl:template>
<xsl:template match="line">
<tr>
<td width="350">
<xsl:value-of select="." />
</td>
<td width="50">
<xsl:variable name="line-nr">
<xsl:number level="any" from="poem" />
</xsl:variable>
<xsl:if test="$line-nr mod 3 = 0">
<xsl:value-of select="$line-nr" />
</xsl:if>
</td>
</tr>
</xsl:template>
</xsl:stylesheet>
Output:
<html>
<body>
<p>
<p>
<table>
<tr>
<td width="350">line 1</td>
<td width="50"></td>
</tr>
<tr>
<td width="350">line 2</td>
<td width="50"></td>
</tr>
<tr>
<td width="350">line 3</td>
<td width="50">3</td>
</tr>
<tr>
<td width="350">line 4</td>
<td width="50"></td>
</tr>
</table>
</p>
<p>
<table>
<tr>
<td width="350">line 5</td>
<td width="50"></td>
</tr>
<tr>
<td width="350">line 6</td>
<td width="50">6</td>
</tr>
<tr>
<td width="350">line 7</td>
<td width="50"></td>
</tr>
<tr>
<td width="350">line 8</td>
<td width="50"></td>
</tr>
</table>
</p>
<p>
<table>
<tr>
<td width="350">line 9</td>
<td width="50">9</td>
</tr>
<tr>
<td width="350">line 10</td>
<td width="50"></td>
</tr>
<tr>
<td width="350">line 11</td>
<td width="50"></td>
</tr>
<tr>
<td width="350">line 12</td>
<td width="50">12</td>
</tr>
</table>
</p>
</p>
</body>
</html>
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