select element by attribute value : select « XSLT stylesheet « XML Tutorial

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File: Data.xml
<?xml version="1.0" encoding="UTF-8"?>
<greeting>
 <welcome xml:lang="en" id="001">Welcome</welcome>
 <welcome xml:lang="fr" id="002">Bienvenue</welcome>
 <welcome xml:lang="es" id="003">Bienvenido</welcome>
 <welcome xml:lang="de" id="004">Willkommen</welcome>
</greeting>


File: Transform.xslt

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method="text" />

  <xsl:template match="greeting">
    <xsl:apply-templates select="welcome[lang('de')]" />
  </xsl:template>

  <xsl:template match="welcome[lang('de')]">
    <xsl:text>German: </xsl:text>
    <xsl:value-of select="." />
    <xsl:text> (ID: </xsl:text>
    <xsl:value-of select="@id" />
    <xsl:text>)</xsl:text>
  </xsl:template>

</xsl:stylesheet>
Output:

German: Willkommen (ID: 004)