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File: Data.xml
<poem author="jm" year="1667">
<verse>line 1</verse>
<verse>line 2</verse>
<verse>line 3</verse>
<verse>line 4</verse>
</poem>
File: Transform.xslt
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0">
<xsl:output method="xml" omit-xml-declaration="yes" indent="no" />
<xsl:template match="poem">
<xsl:choose>
<xsl:when test="@year < 1638">
The poem is one of Milton's earlier works.
</xsl:when>
<xsl:when test="@year < 1650">
The poem is from Milton's middle period.
</xsl:when>
<xsl:when test="@year < 1668">
The poem is one of Milton's later works.
</xsl:when>
<xsl:when test="@year < 1675">
The poem is one of Milton's last works.
</xsl:when>
<xsl:otherwise>
The poem was written after Milton's death.
</xsl:otherwise>
</xsl:choose>
</xsl:template>
</xsl:stylesheet>
Output:
The poem is one of Milton's later works.
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