for-each select="child::parentTagName[@attributeName='your value']"
File: Data.xml
<winelist>
<wine grape="Chardonnay">
<winery>shop 2</winery>
<product>product 2</product>
<year>1997</year>
<prices>
<list>10.99</list>
<discounted>9.50</discounted>
</prices>
</wine>
<wine grape="Cabernet">
<winery>shop 1</winery>
<product>product 1</product>
<year>1998</year>
<prices>
<list>6.99</list>
<discounted>5.99</discounted>
</prices>
</wine>
</winelist>
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="winelist">
<xsl:for-each select="child::wine[@grape='Cabernet']">
<xsl:value-of select="winery" />
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>
Output:
shop 1
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