Re: Computing string-value of nodesets

> The problem is that string([nodeset]) will return the string value of the

but 
<xsl:variable name="x"><xsl:copy-of select="[nodeset]"/></xsl:variable>

<xsl:value-of select="string-length(string($x))"/>

probably does what you want. 

> So is there some way to construct a equivalent of sum(), but one that works
> on string values of a nodeset?

simple cases you can get by as above, but usually you have to use a
node-set extension function for this sort of thing (until xslt 1.1)

for instance if you wanted to apply normalize-space to each of your
nodes in the node set before computing your average, you'd do something
like

<xsl:variable name="x">
  <xsl:for-each  select="[nodeset]" >
   <x><xsl:value-of select="string-length(normalize-space(.))"/>
  </xsl:for-each>
</xsl:variable>

<xsl:value-of select="sum(xt:node-set($x)/x)"/>

David

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