Hallo,
Ist es das, was du meinst?
alle a's:
<xsl:for-each select="node[@attributname='a']">
<xsl:value-of select="self::node()"/>
</xsl:for-each>
alle b's:
<xsl:for-each select="node[@attributname='b']">
<xsl:value-of select="self::node()"/>
</xsl:for-each>
Gruß Mia