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File: Data.xml
<data>
<line lid="u1">hello</line>
<line color="red" lid="u2">hello</line>
<line color="blue" lid="u3">hello</line>
<line lid="u4">hello there</line>
<line color="blue" lid="u5">hello there</line>
<line color="blue" lid="u6">hello</line>
</data>
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" />
<xsl:template match="line">
<xsl:if test="not(@color = preceding::line/@color)">
<xsl:copy>
<xsl:apply-templates select="@*|node()" />
</xsl:copy>
</xsl:if>
</xsl:template>
<xsl:template match="@*|node()">
<xsl:copy>
<xsl:apply-templates select="@*|node()" />
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
Output:
<data>
<line lid="u1">hello</line>
<line color="red" lid="u2">hello</line>
<line color="blue" lid="u3">hello</line>
<line lid="u4">hello there</line>
</data>
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