It depends a bit what your missing nodes are, if it's numbers then the
stylesheet has a chance, if the thing is a list of family birthdays and
I've forgotten one (not uncommon:-) then the stylesheet probably won't
have much of a chance of filling in the gaps. (Hmm now there's a
challenge for Jeni, can she provide a stylesheet that will fill in my
Mum's birthday...)

Anyway for your example,

<xsl:for-each select="//*[position()&lt;/root/obj]">
<xsl:if test="not(position() = /root/obj)">
 <obj><childnode><xsl:value-of select="position()"/></childnode></obj>
</xsl:for-each>

probably works, but not if node 10 was missing.

David

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