<xsl:template match="photos">
    <xsl:for-each select="photo[position() mod 3 = 1]">
        <tr>
            <xsl:aplly-templates select=".|following-sibling::photo[position() &lt; 3]" />
        </tr>
    </xsl:for-each>
</xsl:template>

<xsl:template match="photo">
    <td>
        <xsl:value-of select="@title"/>
        <xsl:value-of select="@id"/>
    </td>
</xsl:template>
Автор: Luzhnikovskiy