This does not work as there may be other nodes between and before
<fragment>. It might look like this and with your solution I get the
wrong positions.

<xsl:template match="fragment">
	<xsl:copy>
		<xsl:attribute name="pos">
			<xsl:value-of select="count(preceding-sibling::fragment)+1"/>
		</xsl:attribute>
		<xsl:apply-templates select="node()|@*"/>
	</xsl:copy>
</xsl:template>

regards,
--
Joris Gillis (http://www.ticalc.org/cgi-bin/acct-view.cgi?userid=38041)
"Et ipsa scientia potestas est"  - Francis Bacon , Meditationes sacrae